Question

please solve no 18​

Answer 1

Answer:

2^n-7 ×5^n-4

2^n-4 × 2^-3 × 5^n-4

(2*5)^n-4 /2^3=1250

(2*5)^n-4 = 1250*8

(2*5)^n-4 = 10,000 = 10^4

10^4 = 10^n-4

4 = n-4

n=8

Answer 2

Answer:

Step-by-step explanation:

Solution is given in above pic

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