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Eddi Din [679]
2 years ago
15

15c² - 5c. Factorise completely ​

Mathematics
2 answers:
KATRIN_1 [288]2 years ago
7 0

Looking at the problem, what we must do to complete this question is to completely factor the expression that was provided.  The expression that was provided is 15c^2 - 5c.

The first step that we must do is to take a look at the expression and see what the two pieces of the expression have in common.  We can see that both 15c^2 and -5c have the number 5 and the variable c associated with them so we can factor out those two.

<u>Factor out 5c</u>

  • 15c^2 - 5c
  • 5c(\frac{15c^2}{5c}) - 5c(\frac{5c}{5c})
  • 5c(3c) - 5c(1)
  • 5c(3c - 1)

Now we have completely factored out the expression that was provided in the problem statement and we came to final answer of 5c(3c - 1).

SVEN [57.7K]2 years ago
3 0

Answer:

5c(3c - 1)

Step-by-step explanation:

Take out the 5c to factor out completely

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10=2/3n+8<br>what is n ?​
alexira [117]

The value of n in the given equation is -2.6

Step-by-step explanation:

Given,

10 = \frac{2}{3n+8}

To find the value of n

10 = \frac{2}{3n+8}

or, 10(3n+8) = 2 [ by cross multiplication]

or, 30n + 80 = 2

or, 30n = 2-80 [ taking the constant values in one side]

or, 30n = -78

or, n = \frac{-78}{30}

or, n = -2.6

8 0
3 years ago
Read 2 more answers
You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 95% confidence lev
Vikentia [17]

Answer:

865

Step-by-step explanation:

We have that in 95% confidence level the value of z has a value of 1.96. This can be confirmed in the attached image of the normal distribution.

Now we have the following formula:

n = [z / E] ^ 2 * (p * q)

where n is the sample size, which is what we want to calculate, "E" is the error that is 2% or 0.02. "p" is the probability they give us, 5 out of 50, is the same as 1 out of 10, that is 0.1. "q" is the complement of p, that is, 1 - 0.1 = 0.9, that is, the value of q is 0.9.

Replacing these values we are left with:

n = [1.96 / 0.02] ^ 2 * [(0.1) * (0.9)]

n = 864.36

865 by rounding to the largest number.

3 0
3 years ago
If f(x)=3x-2 find f-1 (13)​
SOVA2 [1]

Answer:

Firstly

f(x)=3x-2=y then

Interchanging x and y we get

x=3y-2

x+2=3y

y=(x+2)/3

f-1(x)=(x+2)/3

f-1(13)=(13+2)/3

f-1(13)=5

3 0
3 years ago
Budget
Leno4ka [110]
My guess would be A ! Hope this helps
5 0
3 years ago
Help me and explain
yan [13]

TOTAL IS $10


If the party costs $5 and each additional person is $1 and she invites 5 more 5 X 1 = 5


OR 1 + 1 + 1 + 1 + 1

4 0
3 years ago
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