If a = b: + 4 and a - b = 7, what is a+b? give an exact answer, using fractions if necessary; no decimals.

Figure abcd is a parallelogram. if point c lies on the line x = 2, what is the y-value of point c

The radius of the base of a cylinder is 10 centimeters, and its height is 20 centimeters. a cone is used to fill the cylinder with water. the radius of the cone's base is 5 centimeters, and its height is 10 centimeters.

Asix-sided number cube is rolled twice. what is the probability that the first roll is an even numbe and the second roll is a number greater than 4?