The average of 12, 17, 19 and x is 25. find x.

x = 52

Step-by-step explanation:

Formula

Combine the left

Multiply both sides by 4

4*(48 + x)/4 = 25 * 4

48 + x = 100                    Subtract 48 from both sides

48 - 48 +x = 100 - 48      Combine

x = 52

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm

the answer is:

the answer is:

to solve the problem, we need to remember the quotient of power property, it's defined by the following relation:

if we have a quotienf of powers that have the same base, we need to keep the same base and subtract the exponent of the denominator power to the exponent of the numerator power.

so, we are given the expression:

then, calculating we have:

hence, the answer is:

have a nice day!