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3 years ago

I NEED HELP WITH THIS PLEASE HELP ME

Mathematics

1 answer:

vekshin13 years ago

3 0

Answer:

156 minutes

Step-by-step explanation:

So we need to create an equation to represent how Frank's phone company bills him

I will denote "y" as the total for his bill
I will denote "x" as the number of minutes Frank uses

So the phone company charges an $8 monthly fee, so this value remains constant and will be our "y-intercept"

They then charge $0.06 for every minute he talks, this will be our "slope"

Combining everything into an equation, we have: y = 0.06x + 8

Now since we were given Franks phone bill total and want to figure out how many minutes he used, we just need to solve the equation for x and plug in our known y value

y = 0.06x + 8 → y - 8 = 0.06x → $x=\frac{y-8}{0.06}$
Then plugging in our y value we get $x=\frac{17.36-8}{0.06}=\frac{9.36}{0.06}= 156$

Frank used up a total of 156 minutes

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Bruce bought a map that cost $7.35 he used a $10 bill to pay for his map what is the change

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3 years ago

slader Suppose that 8% of all bicycle racers use steroids, that a bicyclist who uses steroids tests positive for steroids 96% of

d1i1m1o1n [39]

Answer:

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Step-by-step explanation:

First, we need to use here two expressions and then do the calculations.

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The second expression to use has relation with the Bayes's theorem which is the following:

P(D|C) = P(C|D)*P(D) / P(C|D)*P(D) + P(C|d)*P(d) (2)

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So, in this case, we will call C for positive and D that is using steroids and d is the opposite of d, which means do not use steroids.

Then, the probabilities are the following:

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P(C|d) = 9% or 0.09

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8 0

3 years ago

I kinda need some help as soon as possible I'll give you 20 points

Shtirlitz [24]

Answer:

x= 5

Step-by-step explanation:

20x=100

divide 100 by 20

x=5

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3 years ago

Luis has saved $6. He doubles the amount he saves each week.Does this represent an exponential function?Complete: this______ rep

Gre4nikov [31]

Answer:

This does represent an exponential function , because his savings increase by a constant rate

Step-by-step explanation:

Let

x -----> the number of weeks

y ----> the amount saved

In this problem we have a exponential function of the form

$y=a(b)^{x}$

where

a is the initial value

b is the base

r is the rate of change

where

$a=\$6$

$r=100\%=100/100=1$ ---- because he doubles the amount each week

$b=1+r$ ----> $b=1+1=2$

substitute

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therefore

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3 years ago