Solve the problem.A reflecting telescope contains a mirror shaped like a paraboloid of revolution. If the mirror is 16 inches across at its opening and is 3 feet deep, where will the light be concentrated?
A. 0.4 in. from the vertex
B. 0.6 in. from the vertex
C. 0.3 in. from the vertex
D. 5.3 in. from the vertex
Answer: A
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Write an English phrase that would translate into the given mathematical expression.4(t + 9)
A. Four times the sum of a number t and 9 B. Four times a number t, increased by 9 C. Four more than the sum of a number t and 9 D. The sum of a number t and 9
Provide an appropriate response.Perform the indicated operation and simplify: 3
- 5
Fill in the blank(s) with the appropriate word(s).
Find the reciprocal of the number.
A. 7
B. 
C. 
D. 
Solve the problem.The surface area of a balloon is given by S(r) = 4?r2, where r is the radius of the balloon. If the radius is increasing with time t, as the balloon is being blown up, according to the formula 
find the surface area S as a function of the time t.
A. S(r(t)) = 
?t9
B. S(r(t)) = 
?t3
C. S(r(t)) = 
?t6
D. S(r(t)) = 
?t6