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ivanzaharov [21]
2 years ago
14

Solve for y 3x+6y=30

Mathematics
2 answers:
balandron [24]2 years ago
6 0

Answer:

the answer= y=5−x/2

belka [17]2 years ago
5 0

Answer: y=-\frac{1}{2} x+5

Step-by-step explanation:

We need to isolate y by itself

Step 1) Subtract 3x from both sides

3x+6y=30\\3x-3x+6y=30-3x\\6y=30-3x

Step 2) Divide both sides by 6 to isolate y

6y=30-3x\\\frac{6y}{6} =\frac{30}{6}-\frac{3x}{6}  \\y=5-\frac{1}{2}x

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A plumber and his assistant work together to replace the pipes in an old house. The plumber charges $30 an hour for his own labo
Korvikt [17]

Answer:

The plumber worked 50 hours, and his assistant worked 25 hours.

Step-by-step explanation:

Since a plumber and his assistant work together to replace the pipes in an old house, and the plumber charges $ 30 an hour for his own labor and $ 20 an hour for his assistant's labor, and the plumber works twice as long as his assistant on this job, and the labor charge on the final bill is $ 2000, to determine how long did the plumber and his assistant work on this job the following calculation must be performed:

40 x 30 + 20 x 20 = 1200 + 400 = 1600

50 x 30 + 25 x 20 = 1500 + 500 = 2000

Therefore, the plumber worked 50 hours, and his assistant worked 25 hours.

6 0
2 years ago
Which of the following algebraic expressions can be used to express the statement "three less than z squared?"
Citrus2011 [14]
"<span>z˄2 − 3" because x squared is z^2, and 3 less of it would mean to subtract it from 3</span>
6 0
3 years ago
Please help find surface area!!
NeTakaya

Answer:

138 cm.

Step-by-step explanation:

So first, we find the S.A. of the front and back.

The diagram says the side length of the front is 3 cm. and 3 cm.

3x3=9. So then, the back is also 9 cm, 9+9=18.

Now to find the S.A.'s of the four sides, you have to see the side lengths of each of them. The side lengths are 3 and 10.

3x10=30. This means each of them is 30 cm.

30x4=120. 120 is the total surface area of the four sides.

To find the total surface area of the whole rectangle, you add all the surface areas.

120+18=138 cm. (Not squared, since it's surface area and not area.)

3 0
3 years ago
Complete this factor tree to find the prime factors of 492
damaskus [11]

Answer:

246

Step-by-step explanation:

next time use a calculator

divide 492 by 2 and you get 246

divide that by 2 and you get 123

and divide that  by 3 and you get 41

4 0
3 years ago
Read 2 more answers
HELP ME PLEASE ECPLAIN WHY
stiv31 [10]

Answer:

A≈110.11

using formula 1/4\sqrt5(5+2\sqrt5)a2

Step-by-step explanation:

8 0
3 years ago
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