5x+(-4)=7x-5 show step by step

Step-by-step explanation:

First you have to add 4 to both sides--5x-4+4=7x-5+4

Now you have 5x=7x-1

Next you subtract 7x from both sides--5x-7x=7x-1-7x

Next you simplyfiy -2x=-1

Now divide by -2 on each side--2x/2=-1/2

So your answer should be--x=1/2

a. 12.5 kg

step-by-step explanation:

f = ma

so

m = f/a = (2500 n)/(200 m/s²) = 12.5 kg

1 n = 1 kg·m/s²

yes

step-by-step explanation: