Solve the problem.The volume of water added to a circular drum of radius r is given by 
, where 
is volume in cu ft and t is time in sec. Find the depth of water in a drum of radius 3 ft after adding water for 4 sec. (Round result to one decimal place.)
A. 0.8 ft
B. 1.4 ft
C. 2.2 ft
D. 0.7 ft
Answer: D
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Solve.In one week, Manisha worked 33.5 hours walking dogs and earned $244.50, including tips. How much did Manisha earn per hour? (Round to the nearest cent if necessary.)
A. $7.32 B. $7.40 C. $7.28 D. $7.30
Simplify the expression.
? 
A. 3
B. 
C. 5
D. 3
Decide whether the given number is a solution of the given equation.Is 6 a solution of x + 10 = 16x?
A. yes B. no
Solve.If the three lengths of the sides of a triangle are known, Heron's formula can be used to find its area. If a, b, and c are the three lengths of the sides, Heron's formula for area is: A = 
where s is half the perimeter of the triangle, or s = 
(a + b + c).Use this formula to find the area of the triangle if a = 7 cm, b = 9 cm and c = 14 cm. 
A. 12
sq. cm
B. 12
sq. cm
C. 12
sq. cm
D. 4
sq. cm