Explain how "9+10=21"

If there's 200 people in one mall and then 1000 more come in and 600 leave how much is left

The sum of two numbers is 41. The smaller number is 11 less than the larger number. What are the numbers?

Hazel paid $32 to have 50 reports printed she then paid $57 to have 100 reports printed the relationship is linear what is the equation with the relationship between the number of reports, x and the cost, y?

Math word problem A construction crew is extending a highway sound barrier that is 13 miles long. The crew builds 1/2 of a mile per week. Write an eqiation that represents the length of y in miles of the barrier after x weeks.

Tell wether the ordered pair is a solution of y=-3x+9 (2,3) and (1,3)

The cost medium pizza with no toppings is $7.50. The cost of each topping is $0.50. a) what is the equation that represents this relation if C represents the cost of pizza and N represents the number of topping?

380 is what percent of 456

What number represents the most accurate estimation of 375+147

The price of a notebook was $3.30 yesterday. Today, the price rose to $3.80. Find the percentage increase. Round your answer to the nearest tenth of a percent.

Yuri needed 24 minutes to solve 6 math problems. how long will he need to solve 10 math problems?