5x^2+15=51; square root property

Dylan has 200 marbles. If Dylan has 10 times as many marbles as Robert, write an equation that shows how many marbles Robert has. Use r to represent the number of marbles of Robert has.

What is the simplified form of the equation 4/5n - 1/5 = 2/5n? A.) n = - 2 B.) n = 4 C.) n = fraction 1 over 2 D.) n = fraction 2 over 3

Write an equation of a line that is parallel to y = 3x + 4 and has a y - intercept of - 3

Hannah has a grid of squares that has 12 rows with 15 squares in each row. She colors 5 rows of 8 squares in the middle of the grid blue. She colors the rest of the squares red. How many squares does Hannah color red?

Misty wishes to obtain 85 ounces of a 40% acid solution by combining a 72% acid solution with a 25% acid solution. How much of each solution should Misty use?

Which equation can be used to find the volume of the cylinder?

F (x) = Square root of 4x+9

The spanish club has 78 members, 42 girls and 36 boys whats the ratio

Ribbon A is 1/3m long. Ribbon B is 1/4m longer than ribbon A. The length of ribbon C is 1 1/2 times the length of ribbon B. What is the length of ribbonC

Factor and simplify: 4a^2c^2 - (a^2-b^2+c^2) ^2