Question

If 3n+ 4n = 42, then n is a. 4. a. 2 c. 7. D .21

Answer 1

Answer:

n = 6

Step-by-step explanation:

First we would plug the values with n, starting with 4.

$3*4 + 4*4 = 28$

So A. is not an option

Now we try 2.

$3*2 + 4*2 = 14$

B is NOT an option

Now we try 7

$3*7 + 4*7 = 49$

Now we try 21

$3*21 + 4*21 = 147$

Now we check what was closest...7

so we try numbers less than 7

n is = to 6

Answer 2

Answer:

n=6

Step-by-step explanation:

3n+4n = 42

(3+4)n = 42

7n = 42

Dividing both sides by the coefficient of n, which is 7, we have

n = 42/7

n = 6