5x+2y=21-x-y=-9 what is the answer

To find the speed of a car, use the expression d divided by t, where d represents the distance and t represents time. Find the speed of a car that travels from Clinton to Greenville in 2 hours.

If a single die is rolled twice there are how many possible outcomes

What is the estimated sum? Round each addend to the nearest ten thousand before adding. 42,359 + 312,738 A. 350,000 B. 352,000 C. 355,000 D. 360,000

Homework Name: Teacher: Score: Date: Word Problems 1) Joan has to spend 34000 on expenses each year. If that amount of money is 85% of her salary, then how much money does Joan make working as an executive per year?

Carol walked 8 miles in 3 hours. John walked 15 miles in 6 hours. Are these rates in proportion

The population of a town is 20,000 and is decreasing at a rate of 5% per year. What is the population after 23 years?

Is 1/9 equal, less, or greater than 1/3?

A 12 ft ladder is leaning against a building. The ladder makes a 45 degree angle with the building how far up is the building does the ladder reach

9x-4y=-7 7x-12y=39

Amanda is 3 years older than Brantley and Carlos is twice as old as Amanda. The sum of their ages is 57. How old is Amanda?