Which answer is not a part of mathematical proofs?

Misha surveyed students in her school about what writing tool they use. She found that 75 use pens; 30 of the pen users are boys. She also found that 28 boys and 32 girls use pencils.

A quadratic function in the form of y=ax2+bx+c if c is repeatedly increased by one to create new functions how are the graphs of the functions the same or different

Solutions for the linear system 3x+y=-15 and 2x-3y=23

Andrew is selling tickets for the school play, and charges t dollars for adult tickets and 2 dollars for child tickets. On Monday, he sold 18 child tickets and 5 adult tickets. On Tuesday, he sold 10 child tickets and 9 adult tickets.

The ratio of the perimeters of two similar triangles is 4:7. What is the area of each of these triangles if the sum of their areas is 65cm^2.

Mr and mrs turner ate 3/4 of a pizza. They want to split the remaining part equally between their two sons how much of the pizza will each son recive

A 16-mb flash drive was sold on sale for $18.50. If this sales price was 81% of the original price, what was the original price?

6,4,7,2 what is the average of 5

Boxes of fruit snacks are on sale at the grocery. The boxes are the same size. A family needs to purchase 24 boxes. There are 3 boxes for 5 dollars and 4 boxes for 6 dollars.

Last year, a construction worker had a gross income of 29,700 of which he contributed 7% to his 401 (k) plan. If he got paid monthly, how much was deducted from each paycheck for his 401 (k) plan?