Ascientist is measuring the temperature change in a chemical compound. the temperature dropped 11 degrees f per hour from the original temperature. after 4 hours, the temperature was 90 degrees f. find the compounds original temperature

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

Does the point (1, sqrt 7) lie on circle shown.