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Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5

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%)