Answer:
19. c 20.b
Step-by-step explanation:
Answer:
240 cell phones
Step-by-step explanation:
=12×1500
=18000÷75
=240
Answer:
aₙ=(-2)ⁿ*2.
Step-by-step explanation:
1) -4*(-2)=8; 8*(-2)=-16; -16*(-2)=32, ...
2) the required equation is:
aₙ=(-1)ⁿ*2ⁿ*2; ⇒ aₙ=(-2)ⁿ*2 or aₙ=(-1)ⁿ*2ⁿ⁺¹.
6x=2x+48
-2 -2
4x + 48
divide bot numbers by 4. X is by itself and then you will have x=24