HELP FAST heat is the energy required for 1 kg of a substance to change phase

What is the solution to the system of equations? (–2, –8) (–1, –5) (0, –2) (2, 4)

The circumference of a redwood tree trunk is 20π ft, and it is 100 ft tall. what is the approximate volume of the redwood tree trunk? 1,000π ft3 10,000π ft3 4,000π ft3 40,000π ft3

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse