Y=-x^2+10x+24 for -1≤ x ≤ 3 (i) please show step by step of subdiving the interval [-1,3] into four equal parts

(ii) please show step by step of constructing upper and lower rectangles for each subinterval

(iii) summing the areas of the upper and lower rectangles

and (b)

PLEASE HELPP

d. vertex

step-by-step explanation:

answer is because 4×10=40

and 98×4= is 392

40,392

step-by-step explanation:

multiplication is multiplication.   it might feel harder depending on what level of math you are in, but generally it will be the same old stuff, while implementing some new concepts and methods of solving work.