Math Questions
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Math
Basic MathGiven the following: f(x) = 3x +7x+8x¹; g(x) = -x + 12x - 212³; and h(x) = 8x³ + 12x + 6x² - 14x¹
Complete the following: h(x) - f(x)
8x³+3x+6x - 7x + 12x22x4
82³-3x+62-7x
82³-3x+6x7x
82³ + 3x + 6x + 7x
Math
StatisticsWattage Good Defective Total
A quality control inspector is checking a sample of light bulbs. The table summarizes her results. If one of the light bulbs is selected at random, find the probability that the light bulb is defective, given that it is a
50 or 100 watt bulb.
The probability is
Math
TrigonometryA statue in a harbor is approximately 325 feet tall. If the angle of elevation of a ship to the top of the statue is 23.7°, how far is the ship from the statue's base? The ship is from the statue's base.
Math
Basic MathA building contractor is to dig a foundation 30 feet long, 24 feet wide, and 9 feet deep. The contractor pays $5 per load for trucks to remove the dirt. Each truck holds 8 cubic yards. What is the cost to the contractor to have all the dirt hauled away?
Math
Basic MathUltrasound is often used to make images of developing fetuses. In particular, by measuring the size of a fetus ultrasound
and then predict its birthdate. To do this requires formulas for fetus size as a function of
age. Verburg et al. (2008) fit data from over 6000 fetal ultrasounds. They measured the femur length, L, (in mm) as a
function of the fetus age,, (in weeks) and found the following formula:
Calculated when t = 20.
L = -37.50 +3.71t - 0.000633t³
Does the rate of growth of the fetus increase or decrease as it ages?
A. Increases and decreases
B. Increases
C. Decreases
D. Not enough information to tell
Math
Permutations and CombinationsHow many different license plates can the State of lowa produce if the requirements are as
follows: 5 slots The first two slots are for letters. The next three slots are for digits from 0 - 9.
1, 240,000
676,000
82
1,757, 600
Math
Basic MathWhat is the value of n in the equation below?
B. infinitely many solutions
C, no solution
2n + 6 = 2n + 10
Math
Basic MathThe graph shows the velocity, in feet per sec, of an object moving horizontally. A positive velocity represents movement to the right. Negative velocities represent movement to the left. What is the change in position of the object from t=0 to t= 13 seconds? The change in position is feet to the left.
Math
Permutations and CombinationsA combination for a keypad is 6 digits long. The digits are from 0-9. The same digits MAY
NOT be used more than once. How many different combinations are there?
54
1,000,000
60
151, 200
Math
Sequences & Series11. (a) Write the first 5 terms of a power series approximation for f(x) = e-x*² centered at
X = 0.
(b) Use the above power series approximation to find an approximation to S₁¹₁e-x² dx,
rounding to 3 decimal places. Show work needed to produce this approximation.
(c) Include a graph, shade the region corresponding to the integration and confirm your
answer above using the computer or calculator to evaluate the integral.
Math
Sequences & SeriesThe real number 0.9 can be written as an infinite series as shown below:
(a) Write the infinite series in sigma notation and use the formula for the sum of a
infinite geometric series to find the sum.
(b) Write the exact value of the infinite sum (not as a repeating decimal).
Math
TrigonometrySolve the triangle. Round to the nearest tenth.
None of the other answers are correct
mZK 113°, h 14, p = 13
mZK 113⁰, h = 15, p = 11
mZK 113°, h = 15, p = 10
mZK-113°, h = 15, p = 7
Math
Definite IntegralsThe infectivity of a certain pathogen is quantified by measuring the area between two curves. The greater the area between the curves, the greater the infectivity of the disease and this quantification provides a means to compare infectivity among various different pathogens. As an example, consider the function f(t) = -0.5t(t + 1)(t - 21) which represents number of infected cells carrying a particular pathogen in the blood of a patient as a function of time t, where t is measured in days. Suppose a patient is considered contagious during the period from time t = 3 days to t = 18 days. Compute the infectivity of this particular disease during the contagious period by finding the area between the function f(t) and the line segment connecting the points (3,f(3)) and (18,f(18)). Include a graph of the area computed.
Math
TrigonometrySolve the triangle. Round to the nearest tenth.
m/C = 57°, a = 12, b = 22
None of the other answers are correct
mZC= 57°, a = 15, b = 19
mZC = 57°, a = 12, b = 19
mZC = 57°, a = 9, b = 19
Math
Basic MathJose's teacher announces that the scores on their most recent Algebra test were normally distributed. The mean score was 72 and the standard deviation was 8. When Jose receives his score, he earned a 75. What percentage of students scored lower than Jose? Show your work on the sketch pad and then write your answer in a complete sentence in the text box.
Math
Basic MathA clothing company determines that its marginal cost, in dollars per dress, is given by the function below. Find the total cost of producing the first 210 dresses, disregarding any fixed costs.
Math
VectorsFind the angle 0 (in radians) between the vectors. (Round your answer to two decimal places.)
u = 6i + 8j
v = -2j
Math
AreaLet R be the area bounded by the graph of y = 16-x² and the x-axis over [0,2]. a) Find the volume of the solid of revolution generated by rotating R around the x-axis. b) Find the volume of the solid of revolution generated by rotating R around the y-axis. c) Explain why the solids in parts (a) and (b) do not have the same volume.
Math
LogarithmsSuppose a sample of a certain substance decayed to 69.8% of its original amount after 300 days. (Round your answers to two decimal places.)
(a) What is the half-life (in days) of this substance? days
(b) How long would it take the sample to decay to one-third of its original amount? days
Math
ParabolaFind the x-intercept(s) and the coordinates of the vertex for the parabola y=x²-4x-5. If there is more than one x-intercept, separate them with commas.
Math
StatisticsHow would you interpret a statistical significance level of 0.48?
This means that the probability for the null hypothesis to be false is 0.48.
This means that the probability for the null hypothesis to be true is 0.48.
This means that the probability for the alternate hypothesis to be true is (1 -0.48).
This means that the probability for the alternate hypothesis to be false is (1 -0.48).
Math
TrigonometryA tower that is 100 feet tall casts a shadow 154 feet long. Find the angle of elevation of the sun to the nearest degree.
The sun's angle of elevation is
(Do not round until the final answer. Then round to the nearest whole number.)
Math
ProbabilityYou throw a dart at the board shown. Your dart is equally likely to hit any point inside the square board.
a. What is the probability your dart lands in the smallest triangle?
b. What is the probability your dart does not land anywhere in the circle?
Math
Permutations and CombinationsA lock has a 3-number code made up of 20 numbers. If none of the numbers are allowed to repeat, how many different ways can you choose three different numbers in order for a unique code?
Math
Basic MathFind an equation of the line with the given slope and containing the given point. Write the equation using function notation. Slope -6; through (1,6) The equation of the line is f(x) =
Math
Basic MathA tennis player hits the ball with an initial speed of 62 feet per second at an angle of 15°, from a height of 2.2 feet. How far away does the ball land in feet? (5 points)
56.372 feet
67.381 feet
60.646 feet
47.293 feet
Math
Basic MathYou have $ 42,000 to invest. You invest seven times as much into investment A as you do investment B. How much money goes into investment A?
A. $ 36,000
B. $ 6,000
C. $5,250
D. $ 36,750
Math
FunctionsThe cost, in millions of dollars, of a 30-second television ad during an annual television event in the years 2000-2010 can be approximated by C(t) = 0.16t+ 1.3 million dollars (0 ≤ t ≤ 10). = 0 represents 2000.) What was the average cost of an ad in the event during the given period?
Math
StatisticsWhat is the purpose of constructing a confidence interval?
In order to find the exact sample proportion.
In order to find a range of values to estimate the population proportion.
In order to find a range of values to estimate the sample proportion.
To find the exact value of the population proportion.
Math
Basic MathA ship leaves port on a bearing of 35.0° and travels 12.4 mi. The ship then tums due east and travels 3.9 mi How far is the ship tom port, and what in the bearing from pot?
The ship ismi from the part
Math
StatisticsThe length of human pregnancies varies normally with a mean of 266 days and a standard deviation of 16 days. What percentage of pregnancies last between 234 and 298 days?
75%
68%
95%
99.7%
Math
StatisticsThe population in a city is 356,902 people.
If this city sees a decline in the population at a rate of 1.4% per year, find the new population after 25 years.
A. 250, 883 B. 351,905 C. 277,037 D. 269,001
Math
Basic MathSet up a simplex matrix (or simplex tableau) for the following standard maximization problem.
Find the maximum value of f = 2x + 4y
subject to the constraints
3x + 4y ≤ 24
x + 5y ≤ 10
x ≥ 0, y ≥0
Math
Basic MathA test of significance produces a p-value of .03. Which of the following conclusions is appropriate?
Reject H, at a significance level of 5%
Accept Ho at a significance level of 5%
Reject Ho at a significance level of 5%
Accept H, at a significance level of 5%
Math
Heights and DistancesA plane rises from take-off and flies at an angle of 15° with the horizontal runway. When it has gained 450 feet, find the distance the plane has flown. The plane has flown
Math
Basic MathAngle C is a right angle. Solve each triangle rounding to the nearest tenth.
mA = 53°, c = 13.3
m/B = 37°, a = 10.6, b = 7.7
m/B = 37°, a = 10.6, b = 7.3
m/B = 37°, a = 12.9, b = 10.3
m/B = 37°, a = 10.6, b = 8
None of the other answers are correct
Math
Basic MathA road is inclined at an angle of 2°. After driving 5050 feet along this road, find the driver's increase in
altitude.
The driver's increase in altitude is
Math
Coordinate systemOne transmitting station is located 170 miles north of another transmitting station. Each station simultaneously sends out a radio signal. The signal from the north station is received 800 milliseconds after the signal from the south station. If the radio signal travels 0.18 miles per millisecond, find the equation of the hyperbola on which the ship is presently located.
Math
Basic MathSolve the following system of equations using a method of your choosing
y=-3x+5
5x - 4y=-3
A. The solution is (1,2) OB. The solution is (2,1) C. The solution is (0,0) D. The solution is (0,1)
Math
LogarithmsWarfarin is a drug used as an anticoagulant. After administration of the drug is stopped, the quantity remaining in a patient's body decreases at a rate proportional to the quantity remaining. Suppose that the half-life of warfarin in the body is 37 hours. Write a differential equation satisfied by Q: How many days does it take for the drug level in the body to be reduced to 35 percent of its original level? time =
Math
Basic MathA test of significance produces a p-value of .06. Which of the
following conclusions is appropriate?
Fail to reject Ha at a significance level of 5%
Fail to reject Ho at a significance level of 5%
Reject H₂ at a significance level of 5%
Reject Ho at a significance level of 5%
Math
Basic MathDetermine whether the following system of linear equations has no solution, only one solution, or infinitely many solutions. If the system has only one solution, find that solution. Selecting an option will enable input for any required text boxes. If the selected option does not have any associated text boxes, then no further input is required.
Math
AreaApproximate the area under the graph of f(x) = 0.05x - 1.44x² +56 over the interval [2,6] by dividing the interval into 4 subintervals. Use the left endpoint of each
subinterval.
The area under the graph of f(x) = 0.05x - 1.44x² +56 over the interval [2,6] is approximately.
Math
Basic MathDana shoots a basketball at an angle of 45° from the horizontal. It leaves her hands 6 feet from the ground with a velocity of 27 ft/s. Step 3 of 3: Determine the height of the ball when it is 27 feet away horizontally. Round to the nearest tenth.
Math
Application of derivativesFind the minimum value of the objective function f(x, y) = x² + y²
subject to the constraint y = r +1
(a) Use the constraint to rewrite the objective function with only a single variable. Then use
single-variable calculus techniques to find the absolute minimum of the new function.
Math
StatisticsAn amusement park would like to determine if they want to add in a new roller
coaster. In order to decide whether or not they should add the new roller coaster,
they poll people at the park to see how many rode the current roller coaster.
• As people are leaving the park they randomly sample 600 people.
• Out of the 600 people, 400 rode the roller coaster at the park.
Construct a 90% confidence interval to represent the proportion of riders who
rode the roller coaster at the park. All conditions for inference have been met.
Math
VectorsFind the projection of u onto v.
u = (4,8)
v = (6,-3)
Write u as the sum of two orthogonal vectors, one of which is projvu
Math
Basic MathSolve the equation: 3 - 121x = 0 Answer: I = Write your answers as a list of integers or reduced fractions, with your answers separated by (a) comma(s). For example, if you get 4 and as your answers, then enter 4,-2/3 in the box.
Math
TrigonometryA marine surveyor uses a rangefinder and a compass to locate a ship and an island in the vicinity of the coast on which she stands. The rangefinder indicates that the island is 386 m from her position and the ship is 589 m from her position. Using the compass, she finds that the ship ship's azimuth (the direction measured as an angle from north) is 319° and that of the island is 38°. What is the distance between the ship and the island?