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3 years ago

Help me with this pls

Mathematics

2 answers:

astra-53 [7]3 years ago

7 0

14 + 7 * 54 / 6 - 7

Use PEMDAS

There are no parenthesis nor exponents so move on to multiplying and dividing work left to right!

14 + 7 * 54 / 6 - 7
14 + 378 / 6 - 7
14 + 63 - 7
77 - 7
70 is your answer

Oxana [17]3 years ago

5 0

Okay, this looks scary, but it's actually pretty easy. To help, we will use an acronym called PEMDAS, which will tell you how to use the order of operations.

Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Now, when it comes to multiplication and division, you do them in the order you see them. But, they always come before addition and subtraction, which follow the same rule.

Let's take a look at the problem now:
14+7×54÷6-7

There are no parentheses or exponents, so we don't have to worry about that. I see multiplication and division, though.

7×54 is first, the product is 378.

14+378÷6-7
There is a division problem now:
378÷6, the quotient is 63.

14+63-7

It looks much easier to solve now, doesn't it?

Add 14 and 63, the sum is 77.

77-7= 70

That's how you solve order of operations, message me if you need any more help with HW! :)

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In math class, 4 students complete individual surveys to determine the percentage of high school teachers that have a second job

dlinn [17]

Answer:

Option D) B and C

Step-by-step explanation:

we know that

To find out the percentage of high school teachers that have a second job, divide the number of teachers that have a second job by the total number of teachers

<em>Survey A</em>

$\frac{28}{110}=0.2545$

Convert to percentage

$0.2545(100)=25.45\%$

<em>Survey B</em>

$\frac{27}{90}=0.3$

Convert to percentage

$0.3(100)=30\%$

<em>Survey C</em>

$\frac{21}{70}=0.3$

Convert to percentage

$0.3(100)=30\%$

<em>Survey D</em>

$\frac{32}{80}=0.4$

Convert to percentage

$0.4(100)=40\%$

Compare the percentages

Surveys B and C have the same percentage

therefore

Surveys B and C show proportional results, because the ratio of the number of teachers that have a second job by the total number of teachers is equal (this number is the constant of proportionality k in a proportional relationship between two variables)

8 0

3 years ago

Which of the following is equivalent to 5(7 - p)?<br> A. -5p+35<br> B 35+5p<br> C -35+ 50

vazorg [7]

Since 7 - p are in the parenthesis and 5 is outside the parenthesis u distribute 5 to 7 and -p. 5 x 7 is 35 and 5 x -p is -5p so ur answer is A, -5p + 35.

7 0

3 years ago

Please help!!!

baherus [9]

Answer:

$\huge \colorbox{red}{ \rm (3x - 7)(x + 1)}$