What is the value of z in the equation z-7.8=32.9?

SOlve the system of equations using substitution y=2x-10 y=4x-8

How old George Washington

After a 15% discount an item cost 22.27 what was the original price?

Express in scientific notation. 0.0872

Two big bags of sugar plus one small bag of flour add up to a total of 12 kg. The difference between the weight of one bag of sugar and one bag of flour is 2 kg. What is the weight of a bag of sugar and a bag of flour?

Write the equation in standard form 4x-3=5y

If John starts work at 8.845am and finishes at 5.15pm. He has 90 minutes of break. How many hours does he work in 5 days?

What is 5a=100 i need a answer?

What does 16/6 equal to as a whole number

How do you find the perimeter of a triangle?