The formula s=3.87square root fr can be used to estimate a cars speed in miles per hour where f is the coefficient of friction and r is the radius of the circle in feet if f =0.7 estimate the cars speed in part A round to the nearest hundredth

s = 3.238√f

Step-by-step explanation:

The only way this question can be solved is in terms of r because its value is not given.

Given that

s = 3.87√rf

f = 0.7

Required

Find s

Substitute 0.7 for f

s = 3.87 * √(0.7 * f)

Split square root

s = 3.87 * √0.7 * √f

s = 3.87 * 0.837 * √f

s = 3.238√f

This is as far as it can be solved.

Substitute whatever the value of f is, to get your complete answer

answer: $201

step-by-step explanation: to get the answer, you first get 3 nieces that he sold and multiply it by 67 and get $201, so he earned $201 selling his nieces.

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -