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statuscvo [17]
3 years ago
9

a washer and a dryer cost $970 combined . the washer costs $70 more than the dryer . what is the cost of the dryer ?

Mathematics
2 answers:
Reika [66]3 years ago
3 0

Answer:

415

Step-by-step explanation:

970 divided by 2 = 485, 485 + 70 = 555

970 - 555 = 415, so your answer is 415

iragen [17]3 years ago
3 0

Answer:

The dryer costs $450 (meaning the washer costs $520)

Step-by-step explanation:

d+d+70=970

2d+70=970

     -70   -70

2d=900

/2      /2

d=450

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harina [27]

Answer:

The interval is (.0817, .118).

Step-by-step explanation:

Let's make this interval! The easy way is to go to STAT->TEST->A, 1-prop z-int, but I will show the long way.

<u>1. Conditions</u>

First we must check the conditions.

<em>Randomization condition: </em>The sample is given to be random, so we can assume independence.

<em>Success/failure condition: </em>Both np>10 and nq>10 must be met.

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<em>10% condition: </em>The sample cannot be greater than 10% of the population.

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All conditions are met, so we can use <u>a 1-proportion z-interval</u> to represent the data.

<u></u>

<u>2. Mechanics</u>

<u>Find </u>\hat{p}<u>, the sample proportion.</u>

103/1030 = .1

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<u>Find z* (z star), the critical z-value.</u>

You can do this on your calculator using 2nd->VARS->3 (or you can memorize it - it's 1.96. Winky face.) This is called the invNorm function, that takes the left side area under the normal curve. But what do we plug in to the invNorm function?

invNorm(.975) = 1.96

<u>Plug values into the equation.</u>

\hat{p} ± z*\sqrt{\frac{\hat{p}\hat{q}}{n} }

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Based on this sample, we are 95% confident that the proportion of people the company contacts who may buy something is between .0817 and .118. That isn't very likely, but maybe they'll make a little profit!

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madam [21]
<h3>Given</h3>

P = 3r + 2s

<h3>Find</h3>

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<h3>Solution</h3>

First of all, look at how this is evaluated in terms of what happens to a value for s.

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To solve for s, you undo these operations in reverse order. The "undo" for addition is adding the opposite. The "undo" for multiplication is division (or multiplication by the reciprocal).

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Step-by-step explanation:

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