Sally ate lunch at a restaurant.

Mathematics

2 answers:

Anni [7]1 year ago

8 0

Answer:

$174.46

Step-by-step explanation:

First you need to find out how many days total she's bought pizza over four weeks (12 days/28 days). Then multiply 12 by 13.42 (days by pizza price) which equals 174.46. That's how i got my answer. Hope it helps.

Paraphin [41]1 year ago

4 0

She spent a total of 161.04

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viktelen [127]

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87.5(the first one)

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3 years ago

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VMariaS [17]

Answer: a) 8.779 years

b) 8.664 years

<u>Step-by-step explanation:</u>

$A=P\bigg(1+\dfrac{r}{n}\bigg)^{nt}$

A: accumulated amount (balance)
P: principal amount (original/initial investment)
r: interest rate (convert to a decimal)
n: number of times compounded per year
t: number of years

Given: A = 1800, P = 900, r = 8% = 0.08, n = 3, t = unknown

$1800=900\bigg(1+\dfrac{0.08}{3}\bigg)^{3t}\\\\\\2=\bigg(1+\dfrac{0.08}{3}\bigg)^{3t}\\\\\\ln\ 2=ln \bigg(1+\dfrac{0.08}{3}\bigg)^{3t}\\\\\\ln\ 2=3t\ ln\bigg(1+\dfrac{0.08}{3}\bigg)\\\\\\\dfrac{ln\ 2}{3\ ln\bigg(1+\dfrac{0.08}{3}\bigg)}=t\\\\\\\large\boxed{8.779=t}$