Answer:
3937500
Explanation:
People watched last year = x
if ratings were up 125% x increased by x and 25% of x
25% of 10.5 million is 2625000
x increased by itself and 2625000
x*2+2625000 = 10500000
cancel out 2625000 by subtracting to both sides
10500000 - 2625000 = 7875000
x*2 = 7875000
cancel out 2 by dividing 2 on both sides
7875000/2 = 3937500
x = 3937500