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3 years ago

What is the value of y? 18+2y+4+10+2x+10

Mathematics

1 answer:

Rus_ich [418]3 years ago

3 0

Answer:

1) 18+2y+4+10+2x+10

2) 42+2y+2x

3) 42+2x=-2y

4) -1(42-2x=2y)

5) (42-2x=2y)/2

y=21-x

Step-by-step explanation:

1) Original equation

2) Combine like terms

3) Since the problem is asking to find the value of Y, Isolate it

4) Multiply by a negative to make Y positive

5) Since what we have left isn't in simplest form, divide by 2

What is left is y=21-x or y=-x+21

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15 - 8 = 4 x 7 What operation would you do first in this expression? 4x7 15-8 8:4

Afina-wow [57]

Answer:

Multiply first. PEMDAS - Parenthesis, Exponents, Multiplication, Divison, Addition, Subtraction.

Step-by-step explanation:

15 - 8 = 4 x 7

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3 years ago

if A and B together can do a piece of work in 10 days and B along can do it in 15 days, how many part of the work does A complet

anzhelika [568]

Answer:

1/5

Step-by-step explanation:

Well work can be defined as: $work = rate \ *\ time$

where rate=amount of work that can be done in one unit of time

let a = rate of work A does in a day

let b = rate of work B does in a day

this means that: $10a + 10b=1$ where work=1 and it just means the entire job has been completed.

Since b can do it alone in 15 days, this means that: $15b=1$

If we divide by 15 here, we get the equation: $b=\frac{1}{15}$

We can now use this definition to substitute it into the first equation we made.

$10a + 10(\frac{1}{15}) = 1$

Multiply the 10 and 1/15

$10a+\frac{2}{3}=1$

subtract 2/3 from both sides

$10a=\frac{1}{3}$

Now divide both sides by 10

$a=\frac{1}{30}$

Now multiply this by 6, since we a represents the amount of work that can be done in a day, we want to find how many parts of the work can be done by a in 6 days

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Now divide both the numerator and denominator by 6

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2 years ago

If a 25 ft rope is cut into two sections with one section 4 times as long as the other section, how long is the shorter piece?

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X = short section of rope
4x = longer section of rope

x + 4x = 25
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x = 5

…or in other words the shorter piece of rope is 5 feet long

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