Amy picks a whole number, squares it and then subtracts 1. She gives her final number to Brian. Brian adds 3 to the number Amy gave him and then doubles that result. Brian's final result is 54. With what number did Amy start?

5

Step-by-step explanation:

5x 5 = 25

25-1= 24

24+3=27

27+27=54

54

Step-by-step

5x 5 = 25

25-1= 24

24+3=27

27+27=54

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it

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!