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3 years ago

11

A rectangle whose length is 7 units less than four times it’s width ?

2 answers:

defon3 years ago

5 0

The width would be 28 and your with would be 21.

Ghella [55]3 years ago

3 0

The length would be 21 and the width would be 28.

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A fridge costs €336 after a price increase of 40%. what was the original price

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3 years ago

Jessica has an account with a credit union. Her account earns 2.2% simple interest yearly. Exactly a year and a half ago, she op

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4 years ago

Phone plan A charges $1.25 for the first minute and $0.15 for every minute thereafter. Phone plan B charges a $0.90 connection f

melomori [17]

Answer:

The answer is (C) $1.25+0.15(x-1)=0.90+0.20x$ .

Step-by-step explanation:

Now, to find the equation for finding the length, in minutes, of a phone call that costs the same under either plan.

<em>Let the phone charges per minute be</em> $x.$

So, to get the equation of the phone plan A as the phone plan A charges $1.25 for the first minute and after that $0.15 for every minute:

$1.25+0.15x-0.15$

$=1.25-0.15(x-1)$

Now, to get the equation of the phone plan B as given phone plan B charges a $0.90 connection fee and $0.20 per minute:

$0.90+0.20x$

As, the phone call that costs the same under either plan.

Thus:

$1.25+0.15(x-1)=0.90+0.20x$

Therefore, the answer is (C) $1.25+0.15(x-1)=0.90+0.20x$ .

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4 years ago

Students are asked to memorize a list of 100 words. The students are given periodic quizzes to see how many words they have memo

nadezda [96]

Answer:

C. dL/dt = k(100 - L)

Step-by-step explanation:

We have a list containing 100 words.

L = number of words memorized at time t.

At any time t, the number of words left to be memorized is 100-L.

Therefore:

$\frac{dL}{dt}\propto 100-L\\ $Introducing k, a constant of proportion$\\\frac{dL}{dt}= k(100-L)$

<u>The correct option is C.</u>

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3 years ago