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 least common denominator of five and three

An unfair coin with Pr[H] = 0.2 is flipped. If the flip results in a head, a marble is selected at random from a urn containing six red and four blue marbles.

Larinda cooked a 4-kilogram roast. The roast left over after the meal weighed 3 kilograms. How many grams of roast were eaten during that meal?

Sean says that to add a number to - 100 and still have - 100 is to add zero. candice says that she can add two numbers to - 100 and still have - 100 who is correts and why

How many variable terms are in the expression 3x^y + 5x^ - 4y + z + 9? (Input a numeric value only)

Is 3 a factor of 16c-8d?

The square root of 59

Whats the rule of adding integers with the same sign

How do I turn - 6.3 into a fraction?

Lawrence's father gave him 200 baseball cards. Each week, Lawrence purchase 25 baseball cards to add to his collection.