Select all the ratios that are equivalent to 4: 5.
14:27.5 2:2.5 3:3.75 2:3 8:10 7:8

 All the ratios that are equivalent to 4: 5 are

2:2.5   3:3.75  and   8:10

Step-by-step explanation:  You can check by making fractions of the ratios.

4/5 = 0.8

2/2.5 = 0.8  Also, the values are each half of the given ratio.

8/10 = 0.8   and the values are double the numbers in the given ratio.

3:3.75   this one is not obvious at first, but each value is .75 or 3/4 of the numbers in the given ratio, and it passes the decimal equivalency test:

3/3.75 = 0.8

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb