Lakeisha spent $4.57 on color and black-and-white copies for her project. She made 7 more black-and-white copies than color copies. How many color copies did she make?

Step-by-step explanation:

Here is the complete question

Lakeisha spent $4.57 on color and black-and-white copies for her project. She made 7 more black-and-white copies than color copies. How much color did she make?

Key: color- $0.44 per page

black-and-white: 7 cents per page

Let the amount of color be x

Let the amount of black and white be y

If amount per page of color is $0.44, then x color will cost 0.44x

If amount per page of white and black cost $0.07, then y white and black will cost $0.07y

Since She made 7 more black-and-white copies than color copies, this means:

y = x+7 1

If the total spent on black and white is $4.57 then;

0.44x+0.07y = 4.57 2

Substitute 1 into 2

0.44x+0.07(x+7) = 4.57

0.44x + 0.07x+0.49 = 4.57

0.51x = 4.57-0.49

0.51x = 4.08

x = 4.08/0.51

x = 8

This means that I made 8 color copies

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18

answer

you start with $5 and save $10 a week until you have at least $45wer

step-by-step explanation: