Question

Can you tell me what do on 21 A-D?!?Plz help me!

Answer 1

a. 3(5)-12=3
3(10)-12=18
b. 45-3(5)=30
45-3(10)=15
c. 7(4(5)+2)-8=7
7(4(10)+2)-8=286
d.3(5-4)²+9=12
3(10-4)²+9=27
Hope this helps!

Answer 2

hey alexa!!
well all you would do is sub the nummbers f9r the letters!
so A. would be 3x10-12 which is 30-12
have fun solving!