5+3/4x=7/12, rewrite the equation so it does not have fractions. Please help​

Which of the following expressions is equal to 2x^2+8

What is the absolute value of -100000000000000?

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)