What is 18 = n - 18 because I don't understand the question

Suppose A and B are 2 x 3 matrices. Which of the following are the dimensions of the product matrix AB?

On a field trip, students ate 3/10 of a box of oranges. Altogether they ate 6 pounds of oranges. How many pounds of oranges were in a full box? Why each tenth of the model is 2 pounds?

Two more than three times a number

The length of marshall's rectangular poster is 2 times its width. If the perimeter is 24 inches, what is the area of the poster?

The perimeter of a rectangle sandpit is 40 meters. The length of the sandpit is 1 meter less than twice it's width. What are the dimensions of this sandpit

500 is how many tens

What is the solution to the following system of equations? y = - x2 - 5x - 4 y = - x2 + 9x - 18

A girl threw a marble 15 m vertically up in the air which later fell and settled at the bottom of a lake 7 m deep. Find the total distance travelled by the marble while falling down?

Joe sold 15 T-shirts for a total of $82.50. What is the unit price?

For the first 18 days of the month, buffet dinner generate $11,800 in sales. The buffet sale target for the month is $18,650. Given that there are 31 days in march, what daily sales goals must you set to meet your buffet sales target for the month