I need answers for these math questions

First one: 2/3 of an hour is 40 minutes

every 10 minutes he finishes 1/7 of the car.

so about 70 minutes

Second one:

2in=1.5kilo

2.5kilo=?

1.5/2=.75

so every 1 inch is .75 kilos

2.5 kilo / .75 kilo = 3.33

so it would take 3.33 inches to get 2.5 kilo

and the last one is just 5(.75) which is 3.75

because if 1 inch = .75 kilo you'd just have to multiply .75(5).

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

i hope this !