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tia_tia [17]
3 years ago
12

A rectangle is 3 times as long as it is wide, and its perimeter is 80 centimeters. Find its dimensions

Mathematics
1 answer:
Free_Kalibri [48]3 years ago
8 0

Say the width is W and the length is L

L=3W (and of course W=W)

Now you use the perimeter formula P=2L+2W

80=2(3W) + 2W)

80=6W+2W

80=8W Divide both sides by 8

W=10

Now that you know the width, substitute it back into L=3W to find the length

L=3(10)

L=30

The dimensions are length: 30 cm and width: 10 cm

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fiasKO [112]

Answer:

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72^2 + b^2 = 75^2

5184 + b^2 = 5625 (subtract 5184 from both sides)

b^2= 441 (find the square root of each side)

b= 21

4 0
3 years ago
What is the solution to the inequality 7x + 2 < –3x + 1?
Likurg_2 [28]

Answer:maybe ask missturky5000

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
How do you simplify square root of -36 all divided by 2 into 3i and -3i?
posledela

Answer:+3i or -3i

Step-by-step explanation:

±√(-36)=+√(-36) or -√(-36)

+√(-1)×√(36) or -√(-1)×√(36) √(-1)=i

+i×6 or -i×6=+6i or -6i

Dividing by 2 we get

+6i/2 or -6i/2=+3i or -3i

5 0
3 years ago
Anna sells home-delivery products for 2 different companies. The first company pays her 10% commission, and the second company p
Norma-Jean [14]

Answer:  $3600

<u>Step-by-step explanation:</u>

Let x represent the monthly sales for the 10% commission job

Let y represent the monthly sales for the 6% commission job

Commission:   .10x + .06y =  600

Monthly Sales:     x  +     y = 7600

Use Elimination Method to solve the system of equations

100(.10x + .06y =  600) --->  10x + 6y =  60,000

 -6(     x  +     y = 7600) ---> <u> -6x - 6y </u>= <u> -45,600 </u>

                                               4x        =    14,400

                                                 x        =     3600

6 0
3 years ago
Find the value of the matrices <br> A) 17<br> B) 12<br> C) 15<br> D) 13
nlexa [21]

Answer:

option C is correct

Step-by-step explanation:

We need to find the determinant.

= -1(7*9 - 3*9)-( -3)(4*9 - 3*3) -2(4*9 -7*3)

= -1(63-27) +3 (36 - 9) -2( 36- 21)

= -1(36)+3(27)-2(15)

= -36+81-30

= 15

Option C is correct

8 0
3 years ago
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