The value of y varies directly with x. When y=3 , x=1 .

What is the value of y when x is 4 ?

ty for heping

Step-by-step explanation:

here y is directly proportional to x,

y ∝ x

y = Kx

when y = 3 and x = 1,

3 = k(1)

k = 3

when x= 4

y = 3(4)

y = 12

Mark ‼️ it brainliest if it helps you ❤️

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:

  answer:

  write 548 as 500 + 40 + 8. multiply each addend by 5. then add the three products to get 2,740.