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 :)
