Why is the answer in this problem

-13 + 9 = - 4 a negative but not in this problem - 5 + 6 = 1

Which of the following is a polynomial? A. (x8-2) / (x-2+3) B. x-x-1 C. x2+2 7x7-2x-4+3

Ice cream was served as a dessert on a ship each person goat half a pint of ice cream. how many half pints did they have on board 1,200 - the quarts of ice cream

How to do 2*+7+2*=19

How many dose vertices dose a square pyramid have?

Eduardo rented a bike from James' Bikes. It cost $19 plus $6 per hour. If Eduardo paid $49 then he rented the bike for how many hours?

A tutor schedules either 30-minute sessions or 60-minute sessions with her students. Last week, the tutor gave 8 sessions which lasted for a total of 7 hours. How many 60-minute sessions did the tutor give last week?

A school playground is in the shape of a rectangle 400 feet long and 200 feet wide if fencing cost $12 per year, what will it cost to place fencing around the playground

Failures of a testing instrument from contamination particles on the product follow a Poisson process with a mean of 0.38 failures per an 8-hour shift. a) Find the probability that the instrument does not fail during a shift.

A principal of $5,350 is placed in an account that earns 3.5% interest. If the interest is compounded annually, how much money will be in the account at the end of 4 years? a. $5,760.06 b. $5,537.25 c. $6,099.00 d. $6,139.25

Ally is making a scale diagram of her classroom. She uses a scale factor of 3 centimeters per foot to draw the diagram. The actual length of the classroom is 18 feet, and its width is 20 feet. What is the area of the scale drawing of the classroom?