Solve the problem.A sample of 400 grams of radioactive substance decays according to the function 
where t is the time in years. How much of the substance will be left in the sample after 10 years? Round your answer to the nearest whole gram.
A. 12 g
B. 1 g
C. 282 g
D. 0 g
Answer: C
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Solve the problem.To remodel a bathroom, a contractor charges $30 per hour plus material costs, which amount to $4800. Therefore, the total cost to remodel the bathroom is given by 
where x is the number of hours the contractor works. Find a formula for 
What does 
compute?
A. f -1(x) = 
- 4800; This computes the total cost if the contractor works x hours.
B. f -1(x) = 
- 160; This computes the number of hours worked if the total cost is x dollars.
C. f -1(x) = 
- 160; This computes the total cost if the contractor works x hours.
D. f -1(x) = 
- 4800; This computes the number of hours worked if the total cost is x dollars.
Factor the trinomial completely. If the trinomial cannot be factored, say it is prime.3y4 + 30y3 + 72y2
A. 3y(y2 + 6y)(y + 4) B. 3y2(y + 6)(y + 4) C. y2(y + 6)(3y + 12) D. 3(y2 + 6)(y2 + 4)
Solve the problem.Ron throws a ball straight up with an initial speed of 40 feet per second from a height of 7 feet. Find parametric equations that describe the motion of the ball as a function of time. How long is the ball in the air? When is the ball at its maximum height? What is the maximum height of the ball?
A. x = 0, y = -16t2 + 40t + 7 5.328 sec, 1.25 sec, 25 feet B. x = 0, y = -16t2 + 40t + 7 2.664 sec, 1.25 sec, 32 feet C. x = 0, y = -16t2 + 40t + 7 2.311 sec, 1.25 sec, 6.988 feet D. x = 0, y = -16t2 + 40t + 7 4.621 sec, 1.25 sec, 177.892 feet
Find the exact value of the real number y.y = arcsec (1)
A. 0
B. 
C. -?
D. ?