Simplify 5a + 4b + 5c + (-2a) + b A. 3a + 5b +5c
B. 3a + 4b + 5c
C. 12abc
D. 7a + 5b + 5c​

A

Step-by-step explanation:

first we will collect like terms

5a-2a+b+4b+5c

3a+5b+5c

therefore the answer is 3a+5b+5c

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step-by-step explanation:

step by step resolutions

1) n+n+1+n+2=51

3n+3=51

3n=48

n=16

the three numbers are 16, 17 and 18.

2) x+15=4x

3x=15

x=5

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3) the two digits are x and y.

y=3x

(10x+y)+(10y+x)=88

y=3x

11x+11y=88

y=3x

x+y=8

x+3x=8

x=2

the original number can be either 28 or 82.

4) n+(n+2)+(n+4)=48

3n+6=48

3n=42

n=14

the numbers are 14, 16 and 18.

5) y=x+3

10y+x+10x+y=143

y=x+3

11x+11y=143

y=x+3

x+y=13

x+x+3=13

2x=10

x=5

the original number can be 57 or 75.

hope this !