Respuesta :

Do you have the answers to the rest/multiple choice part of the test ??

Answer:

D) 21

Step-by-step explanation:

r*t=s*u

14*15= 210

so, the easy way to do it is to just multiply all the answer choices by 10 unitil you get 210.

WHY  because r*t = 210 so, 10*x = 210

If you want the break down just set up an equation 10 *( 5x +1 ) = 210

210/10 =21

21-1=20

20/5=4

PLUG IN, 5*4=20

20 +1 = 21

There you go kiddos :)