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2 years ago

-12=3-2k-3k Solving multi-step equations I give Brainliest!

Mathematics

1 answer:

inessss [21]2 years ago

6 0

Answer:

k = 3

Step-by-step explanation:

-12 = 3 - 2k - 3k

-12 = 3 - 5k

5k = 15

k = 3

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How many sets of 5 students can be selected out of 30 students?

asambeis [7]

There are 142506 ways in which 5 students can be selected out of 30 students.

<h3>How can a certain number of individuals be selected using a combination?</h3>

The selection of 5 students out of 30 students can be achieved with the use of combination since the order of selection is not required to be put into consideration.

By using the formula:

$\mathbf{^nC_r = \dfrac{n!}{r!(n-r)!}}$

where;

n = total number of individual in the set = 30
r = number of chosing individuals to be selected = 5

$\mathbf{^nC_r = \dfrac{30!}{5!(30-5)!}}$

$\mathbf{^nC_r = \dfrac{30!}{5!(25)!}}$

$\mathbf{^nC_r = 142506}$

Learn more about combination here:

brainly.com/question/11732255

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1 year ago

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Is x = 0 a valid potential solution to the equation log(x + 2) + log(x + 5) = 1? (You don't need to solve this equation, just de

Xelga [282]

Answer:

Yes, since log(2) and log(5) both exist as valid values for the logarithm.

didnt check if ur equation is correct though

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2 years ago

Sams annual college tuition will be $230 more than ryan's annual college tuition after sams college tuition increase by 10% next

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Answer:

Sounds like Sam better pull it together

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2 years ago

A telemarketer earns a base salary of $3,000 per month, plus an annual bonus of 2.5% of total sales above $250,000. Which functi

gavmur [86]

Answer:

c S(x) = 12(3,000) + 0.025(x – 250,000)

Step-by-step explanation:

I got it right

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2 years ago

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9 burgers and 1 doughnut cost $31.30. 3 doughnuts and 6 burgers cost $26.70. Find the cost of 2 burgers.

kirill [66]

Step-by-step explanation:

Let assume that

Cost of 1 burger = $ x

Cost of 1 doughnuts = $ y

According to statement, 9 burgers and 1 doughnut cost $ 31.30

$\begin{gathered}\sf \: 9x + y = 31.3 \\ \\ \end{gathered}$

$\begin{gathered}\sf\implies \sf \: y = 31.3 - 9x - - - (1) \\ \\ \end{gathered}$

According to statement again, 3 doughnuts and 6 burgers cost $ 26.70

$\begin{gathered}\sf \: 6x + 3y = 26.7 \\ \\ \end{gathered}$

$\begin{gathered}\sf \: 3(2x + y) = 26.7 \\ \\ \end{gathered}$

$\begin{gathered}\sf \: 2x + y = 8.9 \\ \\ \end{gathered}$

On substituting the value of y from equation (1), we get

$\begin{gathered}\sf \: 2x + 31.3 - 9x = 8.9 \\ \\ \end{gathered}$

$\begin{gathered}\sf \: 31.3 - 7x = 8.9 \\ \\ \end{gathered}$

$\begin{gathered}\sf \: - 7x = 8.9 - 31.3 \\ \\ \end{gathered}$

$\begin{gathered}\sf \: - 7x = - 22.4 \\ \\ \end{gathered}$

$\begin{gathered}\bf\implies \: x = 3.2 \\ \\ \end{gathered}$

So,

Cost of 2 burgers = 3.2 × 2 = <u>$ 6.4</u>

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1 year ago

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