Can someone please check my math questions? My answers are under the questions... I would really appreciate any help
Questions~
16. A car’s speed before a sudden stop can be estimated by the formula
S = √(30gk) , where
S = speed of the car in mph,
g = drag factor, and
k = length of skid mark in feet.
The drag factor during a recent crash was 0.8. What was the approximate speed of the car if it created skid marks 93 feet long?
a. 34 mph
b. 47 mph
c. 68 mph
d. 85 mph
Answer~ d
17. The length of a rectangle is (3x – 7) inches and its width is (x + 5) inches. Find an expression for the perimeter of the rectangle.
a. 4x - 35
b. 4x - 2
c. 8x - 4
d. 8x - 35
Answer~c
18. Which of the following sets does not contain only rational numbers?
a. -5, p/2, 0.5, -0.12
b. -0.4, -0.3333.. , 6.8, 6.888…
c. 11/7, 5/4, 8/5, 32/19
d. ½, ¼, 1/8, 1/16
Answer~ b
19. What is the value of (-3)^
x when x = 3.
a. -27
b. -9
c. 9
d. 27
Answer~a
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