7n — 4 = 31

What is the answer

n=5

Step-by-step explanation:

Simplifying 7n + -4 = 31

Reorder the terms: -4 + 7n = 31

Solving -4 + 7n = 31 Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right. Add '4' to each side of the equation.

-4 + 4 + 7n = 31 + 4

Combine like terms: -4 + 4 = 0 0 + 7n = 31 + 4 7n = 31 + 4 Combine like terms: 31 + 4 = 35 7n = 35

Divide each side by '7'. n = 5

Simplifying n = 5

7n-4=31 and you need an answer for n so

n = 5 hope this helps!

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)