The ratio of blue to red marbles is 2 to 5. if i have a total of 25 marbles , how many would it be blue.

The number of blue marbles is 10

Step-by-step explanation:

The correct question is

The ratio of blue to red marbles is 2 to 5. If I have a total of 35 marbles , how many would it be blue

Let

x -----> the number of blue marbles

y -----> the number of red marbles

we know that

----> ---> equation A

----> equation B

Substitute equation A in equation B

Solve for y

Find the value of x

therefore

The number of blue marbles is 10

since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.

the inverse (opposite operation) of "to the fourth power" is "to the fourth root".

  (x^4) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 3 ^ 1   = 3   (when you take a power to a power, multiply the exponents.)

or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)

step-by-step explanation: