Please help ASAP! <3 Mr. Janes can write 10 tests in 4 hours. This weekend, he needs to write 25 tests. How long will it take him?
Select all of the proportions below that model this situation. Note, you do not need to solve for x.

A - 10 tests/4 hours = 25 tests/x hours
B - 10 tests25 tests = 4 hoursx hours
C - 10 tests/x hours = 25 tests/4 hours

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

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step-by-step explanation:

x equals 1

step-by-step explanation:

f(4)=f(×)

x=1

the answer is 99.