Find f(x)+g(x), given f(x)=x^2-8 and g(x)=-2-x^2

Help please show your work please

Solve the following inequalities and show the solution on a number line. 3/4 (2x-7) ≤ 5

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%)

How many significant figures are there in the number 10.76?