Which equation results from adding the equations in this system?

-2 x + y = 8.

5 x-y = - 5.

7x=13

7x=3

3x=3

3x=13

What is the sum of the series? 10 Σ (7k - 2) k=1

Five girls share 4 sandwiches equally. How many fruit bars does each friend get

A cube has side length a. The side lengths are decreased to 30% of their original size. Write an expression in simplest form for the volume of the cube in terms of a.

Ahmed is taking orders for lunch. A slice of pizza cost $1.5 and a chicken sandwich costs $2.5. He collects $21.5 for the group of 9 people. Let x = number of pizza orders. Let y = number of chicken orders.

Roxanne has $80 in a savings account. The interest rate is 10%, compounded annually. To the nearest cent, how much will she have in 3 years?

Jeff goes to the fair and spends a fourth of his money on the ticket and half of his money on food. If he spent a total of $24, how much did he arrive with

Jenny wants to multiply out the brackets in the expression 3 (2a+1) she writes 3 (2a+1) = 6a+1 show why jenny is wrong

What is the solution to - 122 < - 3 (-2 - 8x) - 8x? A. x < 8 B. x > 5 C. x > - 8 D. x < - 2

2 kitchen assistants can prepare 10 kg of vegetables in 60 minutes. How long would it take 15 assistants to prepare the same amount?

What number has 2 hundreds, the same number of tens as hundreds, and 2 more ones than hundreds?