Which equation can be used to find the surface area of the cylinder?
r = 6 cm
h = 8 cm
S = 2548)2 + 2(12)(8)
S-2(6)2 +2(6)(8)
S-2 (12) +2 (12)(8)
OS-28(6)2 + 2 (6)(8)
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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%)