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2 years ago

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Mary purchased a prepald phone card for $30. Long distance calls cost 8 cents a minute using this card. Mary used her card only

once to make a long distance
call. If the remaining credit on her card is $26.16, how many minutes did her call last?

1 answer:

julia-pushkina [17]2 years ago

4 0

Hey can I have brainlyist I only need one more :)

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PLEASE HELP!! URGENT!!!! UNIT TEST!!!!

slavikrds [6]

ANSWER

$y=-\frac{4}{3}x+\frac{16}{3}$

Or

$3y+4x=16$

EXPLANATION

Let us find the gradient of the line:

$-3x+4y=4$ by rewriting it in the slope intercept form.

$\Rightarrow 4y=3x+4$

We divide through by 4 now;

$\Rightarrow y=\frac{3}{4}x+1$

This is now in the form;

$y=mx+c$

where

$m=\frac{3}{4}$ is he slope.

This implies that the slope of the line that is perpendicular to this line will be the negative reciprocal of $m=\frac{3}{4}$ .

Thus the perpendicular line has slope,

$m=\frac{-1}{\frac{3}{4}}= -\frac{4}{3}$ .

Let the perpendicular line have equation,

$y=mx+c$

When we substitute the slope we have;

$y=-\frac{4}{3}x+c$

We substitute the point. $(4,0)$ to find c.

$0=-\frac{4}{3}(4)+c$

$0=-\frac{16}{3}+c$

$\frac{16}{3}=c$

We substitute c to obtain;

$y=-\frac{4}{3}x+\frac{16}{3}$

Or

$3y+4x=16$

7 0

3 years ago

Read 2 more answers

Find the requested information based on the given facts. The number of transactions is 175. The fee per transaction is $2.75. De

tino4ka555 [31]

Answer:

$481.25

Step-by-step explanation:

The number of transactions is 175.

The fee per transaction is $2.75.

The total fees is calculated as:

Number of transactions × Fee per transaction

175 × $2.75

$481.25

6 0

2 years ago

In class A, John got 85 for his first test John's class mean was 75 and standard deviation was 5. In class B, Kathy got 80 in he

ivanzaharov [21]

Answer:

b. Kathy

Step-by-step explanation:

We compare each of their score by how far away from the mean when in term of the standard deviation. Using the following formula

$\frac{x - \mu}{\sigma}$

For John he is (85 - 75)/5 = 2.

For Kathy she is (80 - 50)/10 = 3.

Since Kathy is 3 standard deviation better than her class' average, while John is only 2's. We conclude that Kathy did better.

6 0

2 years ago

Ryan earn $376 by working 4 days. If he earned the same amount each day, how much he earn working 5 days?

Over [174]

$469.

376/4 = 94.

Then add that too 346

94 + 346 = 469

3 0

3 years ago

Read 2 more answers

Jacob works part time as a cashier at a drugstore. his gross pay for the year was $8000. Based on his income level, the federal

natta225 [31]

The answer for this question would be the letter c I think well I guess

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2 years ago