What are the answer to these questions? or how to work these out?

Question

I need help answering a few questions, can anyone help me please?

1. (a) Make t the subject of the formula

v = u+5t

1. (b) Solve

x-3 = x-5

----

5

2. Three women earned a total of £36

They shared the £36 in the ration 7:3:2

Donna received the largest amount.

(a) Work out the amount Donna received.

A year ago, Donna weighed 51.5kg.

Donna now weighs 8 and a half% less.

(b) Work out how much Donna now weighs.

Answer 1

1a. step 1: bring the u to the left.

      v-u = 5t

      step 2: divide v-u by 5.

      v-u

      ----  = t  

       5    

     Done!

1(b). step 1: bring ur 5 over to the right.

         x-3 = 5(x-5)

         x-3 = 5x-25

         x-3-5x = -25

         -4x-3 = -25

            -4x = -22

               x = (-22) / -4

             DONE!

2. im tired........... :D

Answer 2

1. a)

v = u + 5t

v - u = 5t

(v - u) / 5 = t

so therefore t = (v - u) / 5   --> write in fraction form.

b)

x - 3 = x - 5  --> take like values to one side, change signs if need to

x - x = -5 + 3

0 does not equal -2

therefore no solution