Which ordered pair is the solution to the system of equations?

{x+y=-1

{3x-y=21

A. (5.5, - 6.5)

B. (7, - 8)

C. (10, - 11)

D. (5, - 6)

What is the vertex of the function f (x) = x2 + 12x? (-6, - 36) (-6,0) ( 60) (6,-36)

What is the discount rate for $50 headphones that are on sale for $42

Your middle school has 900 students 1/3 of students bring ther lunch instead of buying lunch at school what is the value of the ratio of the numbers of students who do bring their lunchtime the number of students who dont

Area of polygon A=l*w (7x-9) (3x)

What is the slope of M (3,5) and N (2,6) ?

Brass is made from a mixture of copper and other elements. A mixture that is 80% copper is combined with a mixture that is 60% copper, resulting in 100 pounds of brass that is 65% copper.

in slope intercept form write the equation of a line that is parallel to 3x - 5y = 7 and passes through (0, - 6)

What is the common denominator of eight and 12

It took Lou 2 1/2 gallons of paint to paint one fence. How many gallons of paint will it take Lou to paint 6 fences that are the same size? Express your answer in simplest form.

The ratio of the number of boys to the number of girls in a school is 4:5 there are 95 girls in the school work out the total number of students in the school