Identify the value of x that makes each pair of ratios equivalent. 4. 21 to x and 7 to 10 a.24 b.30 c.40

B

Step-by-step explanation:

Start by writing the ratios equal to each other since they are equivalent.

Notice if you divide 21/3 = 7. Since they are equa then x/3=10. What number divided by 3 equals 10? x=30

your answer is the last one

step-by-step explanation:

divide the length of a'c' by the length of ac to get a scale factor of two

& then reflect vertically (over the y-axis)

so your answer is dilation by a scale factor of 2 followed by reflection over the y-axis

the answer would be 150 books

step-by-step explanation:

if you divide 300 by 2 you will get 150