21=x+21 ty for hrlping step by step pls

Mathematics

2 answers:

VikaD [51]2 years ago

6 0

Answer:

x is 0

Step-by-step explanation:

If you minus both sides by 21 to isolate the variable, you would find that x equals 0

Studentka2010 [4]2 years ago

4 0

X = 0.

Step 1: isolate X by subtracting 21 from both sides of the equation:

21 = x + 21
21 - 21 = x + 21 - 21

This will result into:

0 = x + 0

Step 2: X technically has a coefficient of 1. Therefore:

0 = 1x

Divide both sides of the equation by 1 to isolate x:

0/1 = 1X/ 1

0 = X

Therefore, x = 0.

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Kristen invests $5,745 in a bank. The bank pays 6.5% interest compounded monthly. How long must she leave the money in the bank

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formula is $A=P(1-\frac{r}{n})^{nt}$

where A=final amount

P=principal

r=interest rate in decimal

n=number of times per year it is compounded

t=time in years

we want to find where

A=2P

and P=5745

and r=6.5%=0.065

n=monthly=12

remember that $ln(x^a)=a(ln(x))$

also that $(a^b)^c=a^{bc}$

$2(5745)=5745(1+\frac{0.065}{12})^{12t}$ , solving for t

divide both sides by 5745 to simplify things a bit

$2=(1+\frac{0.065}{12})^{12t}$ I'd rather not simplify this because it give us a decimals and those aren't exact, if we combine, we get 12.065/12 for inside parenthases