Is 5n-m+2 an expression or equation

given that triangle abc is equilateral and line bd is an altitude of triangle abc, how do i prove that line bd is also a perpendicular bisector is line ac?

During a promotion a music store gives a free CD to every 15th customer and free DVD to every 40th customer. Which customer will be the first to get both gifts?

Rewrite 12/17 as a decimal number. Round to the nearest thousandth.

1 plus 1/4 equals what?

You have at most $20 to spend at an arcade. Arcade games cost $.75 each, and snacks cost $2.25 each. Write an inequality that represents the numbers of games x you can play and snacks y you can buy.

Solve the inequality 4x-3 (x+1) > 2-4 (x+2)

Malcolm ran the 440 yard dash and the 220 yard dash a track meet. There are 3 feet in one yard. How many total feet did Malcolm run? Estimate first. Then check for reasonableness.

The distance between home and school is 4.5 miles. On a map it shows the distance to be 9 cm. What is the scale?

Wat da answer 4in 432

Sales at a certain department store follow the model y=85-13.254x where y is the total sales in thousands of dollars and x is the number of years after 2001. What was the first year that sales fell below $50,000?