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3 years ago

I need help with 19,21,and 23

Mathematics

1 answer:

Ulleksa [173]3 years ago

8 0

Answer:

19. 4y+10

20. 15y²-6

21. 0.5x⁴+10.5

Step-by-step explanation:

The distributive property says the factor outside parentheses applies to each of the terms inside parentheses. Terms are collected in the usual way.

19. y + 4 + 3(y + 2) = y + 4 + 3y + 6 = 4y + 10

20. 3y² + 3(4y² -2) = 3y² + 12y² - 6 = 15y² - 6

21. 0.5(x⁴ - 3) + 12 = 0.5x⁴ - 1.5 + 12 = 0.5x⁴ + 10.5

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50 people sponsor Paula and she raises a total of 180 for charity. What is the mean average amount sponsored in pounds

crimeas [40]

The mean is the average of the numbers.

It is easy to calculate: add up all the numbers, then divide by how many numbers there are.

For example: What is the Mean of these numbers?

6, 11, 7

Add the numbers: 6 + 11 + 7 = 24
Divide by how many numbers (there are 3 numbers): 24 / 3 = 8The Mean is 8

Hope this helps :)

3 0

4 years ago

1 + 1 2 ⋅ (4x − 6) = −2

Dmitry [639]

1.4375

Step-by-step explanation:

Step 1:

Let the given equation be $1+12(4X-6)=-2$

To find X simplification of terms using BODMAS ( Brackets Orders Division Multiplication Addition Subtraction) is done as follows.

Step 2:

Let us expand the equation as $1+ (12*4X)-(12*6)=-2$

Step 3:

Let us expand it further as $1+48X-72=-2$

Step 4:

To find X segregate X in one side and all other remaining terms in other side as follows

$48X=-2+72-1$

After the simplification the numerical value is

$48X=69$

Step 5:

Keep X along one side and bring 48 to the denominator of another side to find X as follows

$X=69/48$

And the value of X is 1.4375

4 0

3 years ago

Read 2 more answers

Convert 7-11 to a percent. round to the nearest hundredth

n200080 [17]

7/11 is 0.006 percent.

5 0

3 years ago

7n+12=1/2(14n+24) NEED ANSWER ASAP

Angelina_Jolie [31]

Answer:

n = all real numbers

Step-by-step explanation:

7n+12=1/2(14n+24)

multiply each side by 2

2(7n+12)=2*1/2(14n+24)

distribute

14n+24 = 14n + 24

subtract 14n from each side

14n-14n+24 = 14n-14n + 24

24=24

this is always true

n = all real numbers

3 0

3 years ago

Evaluate log3^8, given log3^2 is equivalent to 0.631

elixir [45]

We will use the followin property of logarithms:

$log(a^b) = b log(a)$

So, we have

$log(3^2) = 2 log(3) = 0.631$

If you multiply both sides by 4, you get

$8log(3) = log(3^8) = 2.524$

7 0

3 years ago