Show that cos2x + 1 = 2cos2 x. Use the "^" key on the keyboard to indicate an exponent. For example, sin2 x would be typed as sin^2x.

On a math test, David correctly answered 28 of the 40 questions. What percent of the questions did David correctly answer? Write and solve a proportion.

Examine the diagram. A triangle has angles A, 60 degrees, 55 degrees. A line is at the top of the triangle and forms angles B, C, and 65 degrees. Angle C is opposite to angle with measure 60 degrees.

Jimmy is having a party and wants to make fruit punch for his friends. He has a recipe that cells for 4 ounces of fruit mix for every 1 gallon of punch. John wants to make at least 7 liters of fruit punch for his party.

Three bags of flour and two bags of sugar wait 32 pounds four bags of sugar wait 32 pounds all bags of flour wait to save it all back to sugar wait to say what is the ratio of the weight of bag of flour two with bag of sugar

Simplify the expression 9k (8k+7)

What is the volume of a rectangular prism with a length of 2.2 cm, a width of 3.1 cm and a height of 1.2 cm

For 9x + 25 = 88, Deena wrote the situation "I bought some shirts at the store for $9 each and received a $25 discount. My total bill was $88. How many shirts did I buy?" A.) what mistake did Deena make? B.

How do you solve this multi-step equation? -4x-7-3x+4=25

Complete the Square and express the quadratic as a square. x2 - 6x + 13 = 0

Find the domain of the function 1/x+4