Find the sum or difference.

Mathematics

1 answer:

gizmo_the_mogwai [7]4 years ago

6 0

$\left[\begin{array}{ccc}-6&-1&5\\4&-4&1\end{array}\right]$

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|-2x + 4| > or equal to 4

gulaghasi [49]

$\text{When you solve for absolute value, there could be two possible outcomes}\\\\\text{In this question, the outcomes could be:}\\\\-2x+4\geq4\\\text{or}\\\\-2x+4\geq-4\\\\\text{Solve:}\\\\\text{Possibility 1:}\\\\-2x+4\geq4\\\\\text{Subtract 4 from both sides}\\\\-2x\geq0\\\\\boxed{x\leq0}\\\\\text{Possibility 2:}\\\\-2x+4\geq-4\\\\-2x\geq-8\\\\\boxed{x\geq4}$

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4 years ago

The first bricklayer can build a wall in 15 days, the second bricklayer can build the same wall in 20 days. How long will it tak

Ugo [173]

Answer:

It takes <u>8 4/7 </u>days for both bricklayers to build the wall together.

Step-by-step explanation:

The first bricklayer takes 15 days to build the wall, which means it builds 1/15 of the wall per day.

The second bricklayer takes 20 days to build the wall, which means it builds 1/20 of the wall per day.

So if they build the wall together, the expression below will tell how much of the wall they build per day together.

1/15 + 1/20

To add the fractions, we must find a common denominator, which is 60.

4/60 + 3/60, which equals 7/60.

So, they can build 7/60 of the wall per day together. How many days will it take them? We must find how many times 7 fits into 60, which can be done by solving 60/7, which is 8 4/7.

So, it takes 8 4/7 days for both bricklayers to build the wall together.

7 0

3 years ago

Please help with this if u know

Stells [14]

Answer: (2x + 1) (x + 2)

8 0

3 years ago

Read 2 more answers

Help please! I’m really confused

mylen [45]

I wpuld say B...because that can be the one Delta planet