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Naddik [55]
4 years ago
3

This week, Michael collected $468 for delivering newspapers. He had 40 repeat customers and 18 new ones. As an incentive, he cha

rged the new subscribers $3 less than the repeat customers. If x represents the amount Michael collects from each repeat customer, which equation models this problem? What is the fee Michael charges each new subscriber?
Mathematics
2 answers:
Maslowich4 years ago
5 0
40x + 18(x - 3) = 468
40x + 18x - 54 = 468
58x = 522
x = 522/58
x = 9 <=== what he charges for repeat customers

x - 3 = 9 - 3 = 6 <===  what he charges new subscribers
kkurt [141]4 years ago
3 0

Answer:

$6

Step-by-step explanation:

Let x be the amount Michael collects from each repeat customer

Since we are given that he charged the new subscribers $3 less than the repeat customers.

So, amount collects from each new customer = x-3

Since he had 40 repeated customers

So, the amount Michael collects from 40 repeat customer = $40x

Since he has 18 new customers

So, amount Michael collects from 18 new customer =$18(x-3)

We are also given that his week, Michael collected $468 for delivering newspapers.

So, the equation becomes :

⇒40x+18(x-3) =468

⇒40x+18x-54=468

⇒58x=468+54

⇒58x=522

⇒x=\frac{522}{58}

⇒x=9

Michael charges for each new subscriber = x-3 = 9-3 =6

Thus Michael charges $6 for each new subscriber

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Step-by-step explanation:

see the attached figure to better understand the problem

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The sine of angle R is equal to divide the opposite side to angle R (PQ) by the hypotenuse (PR)

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sin(R)=\frac{8}{17}

Find the measure of angle R

using a calculator

R=sin^{-1}(\frac{8}{17})

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3 years ago
Kyle ran for 27 minutes on Tuesday. On Wednesday, Kyle ran for n fewer minutes than he ran on Tuesday. On Friday, Lee ran for 3
victus00 [196]

Answer:

(27 - n) times 3 is the expression Kyle should use.

Step-by-step explanation:

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Pregnant women metabolize some drugs at a slower rate than the rest of the population. The half-life of caffeine is about 4 hour
UkoKoshka [18]

Answer:

Husband:

The husband will have 16.35 mg of caffeine in his body at 7 pm.

Woman:

The pregnant woman will have 51.33 mg of caffeine in her body at 7 pm.

Step-by-step explanation:

The amount of caffeine in the body can be modeled by the following equation:

C(t) = C(0)e^{rt}

In which C(t) is the amount of caffeine t hours after 8 am, C(0) is how much coffee they took and r is the rate the the amount of caffeine decreases in their bodies.

110 mg of caffeine at 8 am,

So C(0) = 110

Husband

Half life of 4 hours. So

C(4) = 0.5C(0) = 0.5*110 = 55

C(t) = C(0)e^{rt}

55 = 110e^{4r}

e^{4r} = 0.5

Applying ln to both sides

\ln{e^{4r}} = \ln{0.5}

4r = \ln{0.5}

r = \frac{\ln{0.5}}{4}

r = -0.1733

So for the husband

C(t) = 110e^{-0.1733t}

At 7 pm

7 pm is 11 hours after 8 am, so this is C(11)

C(t) = 110e^{-0.1733t}

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The husband will have 16.35 mg of caffeine in his body at 7 pm.

Pregnant woman

Half life of 10 hours. So

C(10) = 0.5C(0) = 0.5*110 = 55

C(t) = C(0)e^{rt}

55 = 110e^{10}

e^{10r} = 0.5

Applying ln to both sides

\ln{e^{10r}} = \ln{0.5}

10r = \ln{0.5}

r = \frac{\ln{0.5}}{10}

r = -0.0693

At 7 pm

7 pm is 11 hours after 8 am, so this is C(11)

C(t) = 110e^{-0.0693t}

C(11) = 110e^{-0.0693*11} = 51.33

The pregnant woman will have 51.33 mg of caffeine in her body at 7 pm.

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