Question:
Ranges of grade for variation and quantity
1) a student must have an average (the mean) on five tests that is greater than or equal to 80% but less than 90% to receive a final grade of B. Devons grades on the first four tests were 76%,63%,91%, and 80%. What range of grades on the fifth test would give him a B in the course? (assume that 100% is the highest possible grade.)
enter the range of grades necessary for devon to earn a B average.
2) solve the inequality. then graph on a number line, where x is a real number.
X+8>4the solution set is {X|X>?}
3)write the variation and find the quantity indicated. r varies directly as s. find r when s=2 and k=6.
the variation is ?
(type k for the variation constand,do not substitute in values)