Each side of an equilateral triangle measures 30cm. Find the length of an altitude, a , of the triangle?

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%)

Jonathan puts $400 in a bank account. each year the account earns 6% simple interest. how much interest will be earned in 5 years?

Is of - 4x + 2? a. 3 b. 4 c. 6 d. 5