A5-pound bag of apples costs $3.50. at the
same rate, what would be the cost of 7
pounds of apples?

x = $4.90

Step-by-step explanation:

Let x represent the cost of 7 pounds of apples

5/3.50 = 7/x   <  (Cross multiplying to solve )

(FRACTION ABOVE)

5x = 7 * 3.50

x = $4.90

the answer is (4,3)

since the rule for r0, 90º is (-y,x) and it was already applied to form the image, all you have to do is reverse the answer using this formula.

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: