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3 years ago

PLEASE HELP!!

2 answers:

8 0

<span>Let x = the width
:
It says,"The length of a rectangle is 4 less than 3 times the width." write that as:
L = 3x - 4
:
If the perimeter is 40, find the dimensions of the rectangle.
:
We know: 2L + 2W = 40
:
Substitute (3x-4) for L and x for W
2(3x-4) + 2x = 40
:
6x - 8 + 2x = 40; Multiplied what's inside the brackets
:
6x + 2x = 40 + 8; do some basic algebra to find x; (added 8 to both sides)

:
8x = 48
:
x = 48/8
:
x = 6 which is the width
:
It said that L = 3x - 4, therefore:
L = 3(6) - 4
L = 18 - 4
L = 14; is the length
:
Check our solutions in the perimeter:
2(14) + 2(6) =
28 + 12 = 40</span>

Arada [10]3 years ago

4 0

Length= 3x-4
width= x
perimeter= 72 feet
2(3x-4)+2x=72
6x-8+2x=72
8x-8=72
8x=80
x=10
The width is 10 and the length is 26.

Hope this helps!

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taurus [48]

Answer:

c=10mm

Step-by-step explanation:

Using pythagoras theorem,

hypotenuse²=base²+altitude²

=√19²+9²

=19+81

=100

Hypotenuse²=100

Hypotenuse=√100

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2 years ago

Marcus needs to bike at least 80 mi this week for a training if he has already bike 25 mi this week then how many miles should h

Rashid [163]

Marcus needs to bike at least 11 miles each day.

Step-by-step explanation:

Given,

Distance to cover = 80 miles at least

Distance already biked = 25 miles

Number of days left = 5

Let,

x be the distance to cover in 5 days.

According to given statement;

Number of days left * Distance to cover + distance already bike ≥ Total distance to travel

$5x+25\geq 80\\5x+25-25\geq 80-25\\5x\geq 55$

Dividing both sides by 5

$\frac{5x}{5}\geq \frac{55}{5}\\x\geq 11$

Marcus needs to bike at least 11 miles each day.

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7 0

3 years ago

MARKING BRAINLIEST!

Irina-Kira [14]

Answer: Felix has a job that pays 100 dollars an hour, If he makes 2500 dollars a week how many hours does he work each day.

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6 0

3 years ago

Can you help me on this.

jeka57 [31]

Answer:

x=3

Step-by-step explanation:

6 10

---------- = ------------

6+x 15

using cross products

6 * 15 = 10 * (6+x)

90 = 60+10x

subtract 60 from each side

90-60 = 60+10x-60

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3 years ago

A $8,000 principal is invested in two accounts, one earning 1% interest and another earning 6% interest. If the total interest f

lana [24]

The amount invested in the first account is $1,500 and $6,500 was invested in the second account.

What is simple interest?

Simple interest is determined as the principal multiplied by the interest rate ,then multiplied by the duration of the investment.

The formula for simple interest on an investment is as shown below:

I=PRT

P=principal=$8,000

R=interest rates= 1% and 6%

T=duration of investment=1 year

Let assume that X was invested at 1% and that the remaining of $8000-X is invested at 6%.

Interest on the first account=X*1%*1

Interest on the first account=0.01X

Interest on second account=($8000-X)*6%*1

Interest on second account=480-0.06X

Total interest=0.01X+480-0.06X

Total interest=480-0.05X

Total interest=$405

405=480-0.05X

0.05X=480-405

0.05X=75

X=75/0.05

X=amount invested in the first account=$1,500

Amount invested in the second account=$8000-X

Amount invested in the second account=$8,000-$1,500

Amount invested in the second account=$6,500

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2 years ago