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3 years ago

a rectangular room is three times as long as it is wide, and its perimeter is 80 meters. find the length of the room

1 answer:

5 0

Let the width of the room be = x

Length of the room = 3x, Since it is three times as wide

Perimeter = 80m

Perimeter = 2*(L + W) = 2*(3x + x) = 80

2*(3x + x) = 80

2*(4x) = 80

8x = 80 Divide both sides by 8

x = 80/8

x = 10, But length = 3x, = 3*10 = 30

Length = 30m

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Convert to scientific notation: 0.0509.

fomenos

Answer:

5.09 × 10^-2

Step-by-step explanation:

You have to take the number go to the decimal and move it until you get to the first number and in this case, it is 5 put the decimal there. To write it you have to count the number of times you moved the decimal. when doing this it will always be a number times 10^ the number you moved the decimal.

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3 years ago

Speed, Time, and Dis

serious [3.7K]

Answer:

3 hours

Step-by-step explanation:

Recall:

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hence,

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3 years ago

Julie invested 3000 in a simple interest account for 2 years. At the end of the 2 years, she had earned $75 in interest. What wa

Dahasolnce [82]

The simple interest rate was: 1.25%

Step-by-step explanation:

Simple interest is given by:

$A = Prt\\Here\\A => Interest\\P=>Principal\ Amount\\r => Rate\\t => Time\ in\ years$

Given

Principal amount =$3000

Time = t = 2 years

Interest amount = A = $75

putting the values in the formula

$75 = 3000 * r * 2\\75 = 6000r$

Dividing both sides by 6000

$\frac{6000r}{6000} = \frac{75}{6000}\\r = 0.0125\\$

So,

The rate is:

0.0125 * 100 = 1.25%

Hence,

the simple interest rate was: 1.25%

Keywords: Simple interest, percentage

Learn more about interest at:

#LearnwithBrainly

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3 years ago

I don't get this can someone help me?

Anna71 [15]

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3 years ago

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3 years ago

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