2 3/7 - 1 1/4 please give the answer as a mixed number with the fraction part in the lowest terms :))

Estimate the area under the curve f(x) = 16 - x^2 from x = 0 to x = 3 by using three inscribed (under the curve) rectangles. answer to the nearest integer.

If rs 900 amounts to rs 1044 in 4 years, what sum will amount to 1368 in 3 1/2 years at the same rate

Pls yall i really need the answer fr fr