4x^2=81 how do I figure this out

As a means to obtain financial support from French towns, the Capetian Kings? A. Called a representative assembly called the Estates General B. Issued the Magna Carta C. Initiated the Jacqueline D. Developed common law

What would be an appropriate measure to describe the diameter of a music record? A) millimeters B) yards C) Inches D) kilometers

A ball is thrown into the air with an initial velocity of 60 ft/s. its height h in feet after t seconds is given by the function h=-16t^2 + 60t + 6. a : After how many seconds will the ball reach maximum height? b : What is the maximum height?

Susan is 5 years older than her sister. The sum of their ages are 51. Define a variable. Then write an equation that could be used to find their ages

Find two positive numbers a and b (witha≤b) whose sum is 88 and whose product is maximized.

Solve the inequality 6t > t + 6.

What is the answer for -4x+4y=12 3x-4y=-18

rachel is frosting the top of two cakes and wants to know which cake will require more frosting. one cake is round with a diameter of 8 inches. the other cake a square with the length of 9 inches.

What is this 4x + 6 = 10

What is the difference? Express your answer in lowest terms. - 1/10 - (-8/10)