2 years ago

2x-y=3 x+y=0 solve this by substitution method

Mathematics

1 answer:

frez [133]2 years ago

4 0

Answer:

y is -1

x is 1

Step-by-step explanation:

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if 1 gallon of paint covers 400 square feet, about how many gallons of paint are needed to paint the outside of a spherical tank

ollegr [7]

Given:
Diameter if the spherical tank = 20 ft.
Now,
We know,
radius = diameter / 2
= 20 / 2
= 10 ft.
Now,
The area of the spherical tank = $4 \pi r^{2}$

= $4 \pi (10)^{2}$

= $4 * \pi *100$

= $1256.637061$

= $1256.64~ft^2-->rounded$

Now,
According to the question,
400 ft² needs 1 gallon of paint
1 ft² needs (1 / 400) gallon of paint
1256.64 ft² needs (1 / 400) * 1256.64 gallon of paint
= 3.1416 gallon of paint
= 3.14 gallon of paint --------------> rounded

So, we need 3.14 gallon of paint

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4 years ago

A cylinder has a radius of 14 m and a height of 6 m.

ss7ja [257]

D. Use the formula V=πr^2 h.

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4 years ago

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iogann1982 [59]

Answer:

y=-(2±√21)