Which ratio is equal to 15:20?
options:
5 to 10
18:25
21 to 28
24:30

21 to 28

Step-by-step explanation:

15:20

Divide each side by 5

15/5 : 20/5

3:4

we want to find the one that is 3:4

5 to 10  Divide by 5   5/5 to 10/5   1 to 2

18:25    this does not simplify

21 to 28   divide by 7   21/7 to 28/7    3 to 4

24:30 divide by 6  24/6: 30/6  4:5

there are many solutions.

step-by-step explanation:

step 1: simplify both sides of the equation.

4x+6=4x^2+10x−4

step 2: subtract 4x^2+10x-4 from both sides.

4x+6−(4x^2+10x−4)=4x^2+10x−4−(4x^2+10x−4)

−4x^2−6x+10=0

step 3: factor left side of equation.

−2(2x+5)(x−1)=0

step 4: set factors equal to 0.

x=-5/2 or x=1