3x + y = - 21

x+y=-5

solving systems of equations by substitution

Complete the comparison: 3 + 7 >? A. 8+2 B. 10 - 2 C. 7+3 D. 9+4

A pump is running at a rate of 6.4 quarts per minute. How many gallons per hour is this? A. 192 gal / hr B. 48 gal / hr C. 96 gal / hr D. 1536 gal / hr

The gravitational attraction between two masses varies inversely as the square of the distance between them. If the attraction force between them is 75 lbs.

How many and what type of solutions does the equation have?2c^2 = 16c - 32a. two nonreal solutionsb. one rational solutionc. two rational solutionsd. two irrational solutions?

What is the inverse of (2n-8)

The weight of an object on a particular scale 155. 2lbs the measured weight May very from the actual weight by the most 0.4 lbs what is the actual weight of the objects

Circumferenceif a circle is 62.8inches, whats is the radius

What is a letter or symbol that represents some unknown value

Write a percent proportion and solve each question 1) 39 is 5% of what number? 2) 90 is 36% of what number? 3) 22 is 25% of what number? 4) 6 is 75% of what number?

Cecilia traveled to Canada and bought a new lamp for 460 Canadian dollars. If the Canadian dollar is worth $.8817 against the U. S. dollar, how much would the same lamp cost in the United States? (Round to the nearest cent.) A. $405.58 B. $517.77 C.