S÷5=5 how do u solve this i'm not sure if 25 is correct

Write the summation to estimate the area under the curve y = 1 + x2 from x = -1 to x = 2 using 3 rectangles and right endpoints

Reagan lives five miles farther from school than vanessa lives. write an expression to describe how far reagan lives from school

F. a fair coin is thrown in the air four times. if the coin lands with the head up on the first three tosses, what is the probability that the coin will land with the head up on the fourth toss? a. 0 b. 1/16 c. 1/8 d. 1/2