If the arithmetic mean of 4x, 3x, and 12 is 18, then what is the value of x?

x = 6

Step-by-step explanation:

When we find the average, we need to add up all the values and divide the answer by the number of values.

We can use this idea as a formula to answer the question:

(4x + 3x + 12) /3 = 18

collect like terms:

(7x + 12) / 3 = 18

Get rid of the fraction:

7x + 12 = 18 x 3 (multiply both sides by 3)

7x + 12 = 54

move x to one side:

7x = 54 - 12 (to do this we subtract 12 from both sides)

7x = 42

x = 42/7  (divide both sides by 7)

x = 6

Hope this helps,

Cate

50-60=10

step-by-step explanation:

30.5*10=350$

you have to multiply the number without the decimal point then add it later but if its tenn u must move the place value of the decimal point 1 to the right.