Question

I just need help with these math questions

Answer 1

Answer:

See below.

Step-by-step explanation:

1.   7/9 , 28/36      Because 7*4 = 28 and 9*4 = 36

     14/18, 21/27     Because 14 * 1.5 = 21 and 18*1.5 = 27

2.  9/14 , 3/4        Because 9/3 = 3  but 14/4 = 3. 5

3.     m = 6

4     12.8

Answer 2

1. Proportions are relatively easy; we can reduce the fractions or check the cross product

4/20 = 1/5 not 1/6

28/36 = 7/9, CHECK

14/18=7/9,  21/27=7/9  CHECK

30/80=3/8, 6/18=1/3, nope

2. Let's check cross products on these

3(40)=120, 5(24)=120, no these are proportions

30(5)=150, 15(10)=150, no, proportions

9(4)=36, 3(14)=42,  CHECK 9/14 is not 3/4

7(24)=14(12) true without multiplying it out; these are proportional

3.

4/16 = m/24

24(4) = 16 m

6(4)(4) = 16 m

Answer: m = 6

4.

t/16 = 40/50 = 4/5

5t = 16(4)=64

10t = 128

Answer: t = 12.8