21x+7y=42 and - 5x+5y=10

Find the solution to the system of equations

I have a that is 1000 milligrams and I suppose to take a 200 milligrams how many milliliters will I take?

What is the standard form for 85 million 16 thousand twelve

If x = 2 calculate the value of x³+x

Melvin and Sylvia are married with no children, and they're filing their federal income tax return. Melvin had a gross income of $44,500 last year, while Sylvia had a gross income of $51,200, and they plan to use the standard deduction.

How do I do this? Square A= S=35cm

Lita estimates she will read 24 books during the summer. She actually reads 9 books. what is the percent error of her estimate?

We mathematical induction to prove the statement is true for all positive integers n. 8+16+24 + ... + 8n=4n (n+1)

How do we know that it's a parallel line

The Rivera family drove 267.9 miles from their home to Cape Cod, Massachusetts. They used 9.5 gallons of gas. How many miles per gallon of gas did they get on the trip?

What is the product? - 3 4 2 - 5 3 - 2 1 0