100 POINTS! PLEASE HELP WILL MARK BRAINLIEST Scott is revising for a test that has 20
marks. He thinks the length of time he spends revising
for a test is directly proportional to the number of marks he gets. If he revises for
30 minutes he gets 12 marks. Assuming Scott is correct

How long would he need to revise to get
18
marks?

It would take 45 minutes to get 18 marks

Step-by-step explanation:

30 ÷ 12 = 2.5

2.5 x 18 = 45

It would take 45 minutes to get 18 marks

step-by-step explanation: given equation a = h(b 1+b 2)

also we are given values of a, h and b 1 as :

a = 16, h = 4, and b 1 = 3.

in order to solve it for b 2, we need to plug the given values of   a, h and b 1 .

therefore, plugging values of   a, h and b 1   in given equation, we get

16 = 4( 3 + b 2)

first dividing both sides by 4, we get

4 = 3 + b 2

subtracting 3 from both sides, we get

4 -3 = 3 -3 + b 2

1 = b 2.

the answer is

a.

x = 42

y = 10

i got it down chief.