11-09-2021
Mathematics

contestada

PLEEAAAASE help
if a+1 is divisible by 3 prove that 4+7a is divisible by 3 too

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hhelsinki hhelsinki

11-09-2021

Answer:

Given a is 5

Step-by-step explanation:

I. Given a is 5

= a + 1

= 5 + 1

= 6

6 is divisible by 3 => true

II. Find 4 + 7a value

= 4 + 7(5)

= 4 + 35

= 39

39 is divisible by 3 => true

III. Prove by

6 ÷ 3 = 3

39 ÷ 3 = 13

Hope that help :)

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