2 years ago

What is 4/5 of 55? Pls help me

Mathematics

2 answers:

Shtirlitz [24]2 years ago

5 0

Answer:

44 i know that's right let me know

rjkz [21]2 years ago

4 0

Answer:

Step-by-step explanation:

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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

s344n2d4d5 [400]

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

$2=(\frac{12.065}{12})^{12t}$

take ln of both sides

$ln(2)=ln((\frac{12.065}{12})^{12t})$

$ln(2)=(12t)ln(\frac{12.065}{12})$

divide both sides by $12ln(\frac{12.065}{12})$

$\frac{ln(2)}{12ln(\frac{12.065}{12})}=t$

using our calculator, t≈10.6927

so rounded, we get 10.7 years

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3 years ago

Let f(x) = 5x + 6 and g(x) = -7x - 4. <br> Find f(x) + g(x)

sattari [20]

5x + 6 + (-7x - 4)

5x + 6 - 7x - 4

-2x + 2

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(x + 13y) + 8y=<br> :\ This is so confusing

anygoal [31]

Answer:

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Step-by-step explanation:

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Math worth 10 points thx

bija089 [108]

what thy answer child

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Write the solution of the given system of equations

Citrus2011 [14]

Answer:

Step-by-step explanation:

The solution to this system of equation is (4, 10)

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