2 years ago

30. The total cost of a sandwich, a glass of

Mathematics

2 answers:

Natasha_Volkova [10]2 years ago

7 0

Answer:

Apple=$0.60

Sanwich=$2

A glass of milk=$0.90

Step-by-step explanation:

seraphim [82]2 years ago

6 0

$56 i did the test on i ready

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Answer:

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Step-by-step explanation:

Given: P = $3000, r = 0.085

$A = Pe^{rt}$

Where

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P is the Principal

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(a) For the amount to double, A = 2 × P

A = 2 × $3000

A = $6000

$6000 = 3000e^{0.085t}$

$\frac{6000}{3000} = e^{0.085t}$

$2 = e^{0.085t}$

Take $log_{e}$ of both sides

$log_{e}2 = log_{e}e^{0.085t}$

But $log_{e}e = 1$

∴ $ln2 = 0.085t$

$t = \frac{ln2}{0.085}$

$t = \frac{0.693}{0.085}$

t = 8.15

(b) For the amount to double, A = 3 × P

A = 3 × $3000

A = $9000

$9000 = 3000e^{0.085t}$

$\frac{9000}{3000} = e^{0.085t}$

$3 = e^{0.085t}$

Take $log_{e}$ of both sides

$log_{e}3 = log_{e}e^{0.085t}$

But $log_{e}e = 1$

∴ $ln3 = 0.085t$

$t = \frac{ln3}{0.085}$

$t = \frac{1.0986}{0.085}$

t = 12.92

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