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3 years ago

Pleaseee help this is urgent!!! I need it in English! Please show all the work ! 14 points

Mathematics

1 answer:

zzz [600]3 years ago

3 0

Answer:

width = 40 feet, length = 90 feet

Step-by-step explanation:

length = 2w + 10

width = w

Perimeter = 260

Perimeter of rectangle = 2length + 2width

Sub the values into that equation:

260 = 2(2w + 10) + 2(w)

260 = 4w + 20 + 2w

260 = 6w + 20

260 - 20 = 6w

240 = 6w

w = 240/6

w = 40

So now we know the width of the garden is 40 feet.

To find the length, substitute the width into the length equation:

length = 2w + 10

length = 2(40) + 10

length = 90 feet

length = 90 feet, width = 40 feet

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You can earn money by tutoring for $8 per hour and by walking dogs for $7.50 per hour. If you are scheduled to tutor for 10 hour

hoa [83]

Answer:

28 hours

Step-by-step explanation:

Let the number of hours required to:

Tutor = x

Walk the dog = y

If you are scheduled to tutor for 10 hours during the week

x = 10........ Equation 1

You can earn money by tutoring for $8 per hour and by walking dogs for $7.50 per hour. Create and solve an inequality that represents the number of hours you can walk dogs during the week in order to earn at least $290 for the week

$8 × x + $7.50 × y ≥ $290

8x + 7.50y ≥ 290..... Equation 2

We substitute 10 for x in Equation 2

8(10 ) + 7.50y ≥ 290

80 +7.50y ≥ 290

7.50y ≥ 290 - 80

7.50y ≥ 210

y ≥ 210/7.50

y ≥ 28 hours

The number of hours you can walk dogs during the week in order to earn at least $290 for the week is 28 hours

3 0

3 years ago

Solve the system by either substitution or elimination<br> X-3y-3z=9<br> 5x-3y+3z=-3<br> -4x+2y-4z=4

zlopas [31]

X - 3y - 3z = 9
5x - 3y + 3z = -3
--------------------add
6x - 6y = 6

x - 3y - 3z = 9.....multiply by -4
-4x + 2y - 4z = 4..multiply by 3
-------------------
-4x + 12y + 12z = -36 (result of multiplying by -4)
-12x + 6y - 12z = 12 (result of multiplying by 3)
-----------------add
-16x + 18y = - 24

6x - 6y = 6.....multiply by 3
-16x + 18y = -24
---------------------
18x - 18y = 18 (result of multiplying by 3)
-16x + 18y = -24
--------------------add
2x = - 6
x = -6/2
x = -3

6x - 6y = 6
6(-3) - 6y = 6
-18 - 6y = 6
-6y = 6 + 18
-6y = 24
y = -24/6
y = -4

x - 3y - 3z = 9
-3 - 3(-4) - 3z = 9
-3 + 12 - 3z = 9
9 - 3z = 9
-3z = 9 - 9
-3z = 0
z = 0

so ur solution is (-3,-4,0)

4 0

3 years ago

Solve the equation<br> x/7= 0.4

OleMash [197]

Answer:

x = 2.8

Step-by-step explanation:

x/7 = 0.4

multiply both sides by 7

0.4*7 = 2.8

x = 2.8

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