Answer:
Step-by-step explanation:
10a-15b
<span>3[4(23)-52+7(8+42)-16]</span>
<span>3 x (4 x 8 - 52
+ 7 x (8 + 42) - 16)</span>
<span>3 x (32 - 52
+ 7 x (8 + 42) - 16)</span>
<span>3 x (16 – 52
+ 7 x (8 + 42))</span>
<span>3 x (16 - 25 +
7 x (8 + 42))</span>
<span>3 x (-9 + 7 x
(8 + 42))</span>
3 x (-9 +7 x
(8 + 16))
3 x (-9 + 7 x
24)
3 x (-9 + 168)
3 x 159
477
Step-by-step explanation:

Step-by-step explanation:
there 5^(n+1) + 5^(n+2) = 5^n x 5^1 + 5^n x 5^2 breaking them as x^(a+b) = x^a x x^b
then taking common 5^n from both terms