URGENT!! Really need help on this test

Mathematics

1 answer:

Katyanochek1 [597]3 years ago

7 0

Answer:

G= L &M

H=L &M

K=P&N

J=P&N

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If 5 workers can pave 10 driveways in 30 days, how many days would it take 20 workers to pave 38 driveways?

mel-nik [20]

5*30/10 = 20x/38

150/10 = 20x/38 =

5700/200x=

x= 5700/200 = 28.5 days

6 0

3 years ago

Y-8+2 less than or equal to -2+2

lilavasa [31]

Y-8+2≤-2+2
remember you can do anything to an equaiton as long as you do it to both sides

y-8+2≤-2+2
y-6≤0
add 6 to both sides
y+6-6≤0+6
y+0≤6
y≤6

4 0

3 years ago

The length of a rectangular garden is 15 feet longer than its width. if the area of the garden is 154 square feet, what are the

Advocard [28]

The length would be 22 ft.
The width would be 7 ft.
A=lw
A=22(7)
A=154 ft^2

5 0

3 years ago

An aquarium with a square base has no top. There is a metal frame. Glass costs 8 dollars/m^2 and the frame costs 7 dollars/m. Th

Irina-Kira [14]

Given that the volume of the aquarium is 20m^3.

Volume = Area of Base x height

Area of Base = Volume / height = 20/h

Given that the aquarium has a square base.

Area of square = l^2

Thus, the length of the base of the aquarium is $\sqrt{area \ of \ base} = \sqrt{ \frac{20}{h} }$

The frame is to cover 8 sides with the length equal to the length of the base and 4 sides with the length of the height.

Thus, the total perimeter of the frame is given by $8\sqrt{\frac{20}{h}}+4h= \sqrt{64\left(\frac{20}{h}\right)}+4h = \sqrt{\frac{1,280}{h}}+4h$

Area of the four side faces of the aquarium is 4 times the length of the base times the height = $4\times\sqrt{ \frac{20}{h} }\times h=\sqrt{16\left(\frac{20}{h}\right)h^2}=\sqrt{320h}$

Total area to be covered by grass is the base and the four side faces and is given by $\frac{20}{h}+\sqrt{320h}$

Cost of the entire metal frame = $7\left(\sqrt{\frac{1,280}{h}}+4h\right)= \sqrt{49\left(\frac{1,280}{h}\right)}+7(4h) = \sqrt{\frac{62,720}{h}}+28h$

Cost of the entire grass = $8\left(\frac{20}{h}+\sqrt{320h}\right)=\frac{160}{h}+\sqrt{64(320h)}=\frac{160}{h}+\sqrt{20,480h$

Therefore, total cost in terms of the height, h, is given by

$C=\sqrt{\frac{62,720}{h}}+28h+\frac{160}{h}+\sqrt{20,480h$

3 0

4 years ago

The diagram shows the dimensions of Mr. Green's garden. A bag of fertilizer costs $3 and covers an area of about 50 square feet.

Komok [63]

Answer:

just multiply the numbers

4 0

3 years ago

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