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Thepotemich [5.8K]
3 years ago
9

Solve for t. 3(t – 13) = 18

Mathematics
2 answers:
Anika [276]3 years ago
6 0

Answer:

t = 19

Step-by-step explanation:

1) Distribute the 3. Now the equation is 3t - 39 = 18

2) Add 39 to both sides. The equations is now 3t = 57

3) Divide both sides by 3. t = 19

4) Plug 19 in for t in the original equation to double check your work. 19 is correct.

DerKrebs [107]3 years ago
4 0

Answer:

t = 19

Step-by-step explanation:

<u>Step 1:  Distribute</u>

3(t - 13) = 18

3t - 39 = 18

<u>Step 2:  Add 39 to both sides</u>

3t - 39 + 39 = 18 + 39

3t = 57

<u>Step 3:  Divide both sides by 3</u>

3t / 3 = 57 / 3

t = 19

Answer:  t = 19

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It is known that 60% of the students at a large university have a job and 40% do not have a job. If three of these students are
marin [14]

Answer:

b. 0.216

Step-by-step explanation:

For each student, there are only two possible outcomes. Either they have a job, or they do not. The probability of a student having a job is independent of other students. So we use the binomial probability distribution to solve this problem.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

60% of the students at a large university have a job

This means that p = 0.6

If three of these students are randomly selected what is the probability all three have jobs?

This is P(X = 3) when n = 3. So

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 3) = C_{3,3}.(0.6)^{3}.(0.4)^{0} = 0.216

So the correct answer is:

b. 0.216

4 0
3 years ago
If n denotes a number to the left of 0 on the number line such that the square of n is less than 1/100, then the reciprocal of n
andriy [413]

Answer: E. Greater than 10

Step-by-step explanation:

First, know that number to the left of a number line are negative and the square of any negative number will be positive and a perfect square.

Since the square of the unknown number is less than 1/100 i.e 0.01 then the possible unknown number 'n' can be -0.01 itself, of which the square of -0.01 will give us 0.0001 (1/10,000) i.e a value less than 0.01.

The reciprocal of 1/10000 is 10,000 which is a value greater than 10.

6 0
3 years ago
Solve by addition method <br>3x+y=8 <br>2x-y=7
Vinil7 [7]

Answer:

(3,-1)

Step-by-step explanation:

So we have the system of equations:

3x+y=8\\2x-y=7

As directed, add straight down. The y-variable will cancel:

5x=15

Now, divide both sides by 5. The left cancels:

x=3

So x is 3.

Now, substitute 3 for x in either of the equations:

3x+y=8

Substitute 3 for x:

3(3)+y=8

Multiply:

9+y=8

Subtract 9 from both sides:

y=-1

So, our answer is: x=3, y=-1 or (3,-1).

And we are done :)

7 0
3 years ago
Augustin has 20 different chess boards. If he played 3 games per day, each game played on a different board, how long would it t
Nutka1998 [239]

Answer:

514 days

Step-by-step explanation:

We use the formula (r+n-1)/r(n-1)

There are 1540 combinations. Then, we'll divide them by three because were not just finding the amount of combinations, but the time it'd take to play them all.

We get 513.333(cont.)

thats not really possible, so we're gonna go with 514 instead, rounding up. Normally we'd round down, because the number behind the decimal is below 5, but we really want to make sure we get every combination in there.

Hope this is helpful!

8 0
3 years ago
What is 243=m+108.27?
KATRIN_1 [288]

Answer:

134.73

Step-by-step explanation:

Solving for m:

243 = m + 108.27

243 - 108.27 = m + 108.27 - 108.27

134.73 = m

7 0
3 years ago
Read 2 more answers
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