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3 years ago

If f(x) = 3x + 1 and f^-1 = x-1/3 , then f^-1(7) = A . 22 B . 2 C . -2

Mathematics

1 answer:

kolezko [41]3 years ago

5 0

B

You can find it by plugging 7 in for x in the f^-1(x). so, 7-1/3
6/3
2

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Find the measure of the largest angle in ABC if a = 12, b = 8 and c = 13.

Papessa [141]

Answer:

$C=78.28^{\circ \:}$

Step-by-step explanation:

We are given a triangle

whose sides are

a=12

b=8

c=13

Since, c is largest among them

So, angle C must be largest angle

we can find angle C

we can use law of cosine formula

$cos(C)=\frac{a^2+b^2-c^2}{2ab}$

now, we can plug values

$cos(C)=\frac{12^2+8^2-13^2}{2\times 12\times 8}$

$cos(C)=\frac{13}{64}$

now, we can find angle

we get

$C=78.28^{\circ \:}$

5 0

3 years ago

What is the value of x=2x + 9 = -27

Sergio039 [100]

<h3>I'll teach you how to solve 2x + 9 = -27</h3>

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2x + 9 = -27

Subtract 9 from both sides:

2x+9-9 = -27-9

SImplify:

2x=-36

Divide both sides by 2:

2x/2 = -36/2

Simplify:

x= -18

Your Answer Is x= -18

plz mark me as brainliest if this helped :)

5 0

3 years ago

Read 2 more answers

On a certain hot summer day, 481 people used the public swimming pool. The daily prices are 1.25 for children and 2.25 for adult

spayn [35]

Answer:the number of children that swam in the public pool that day is 222

the number of adult that swam in the public pool that day is 259

Step-by-step explanation:

Let x represent the number of children that swam in the public pool that day.

Let y represent the number of adult that swam in the public pool that day.

On a certain hot summer day, 481 people used the public swimming pool. This means that

x + y = 481

The daily prices are 1.25 for children and 2.25 for adults. The receipts for admission totaled to 86.25. This means that

1.25x + 2.25y = 860.25 - - - - - - - -1

Substituting x = 481 - y into equation 1, it becomes

1.25(481 - y) + 2.25y = 860.25

601.25 - 1.25y + 2.25y = 860.25

- 1.25y + 2.25y = 860.25 - 601.25

y = 259

Substituting y = 259 into x = 481 - y, it becomes

x = 481 - 259

x = 222

8 0

3 years ago

If you work for an hourly wage, your gross pay is a function of the number of hours that you work. Your hourly wage is $8.50 per

ziro4ka [17]

Your answer would be A because gross pay= 8.50$ times the number of hours you work.

6 0

3 years ago

The sum of one and the product of one and a number x

Annette [7]

1 + 1x

1 + x

They mean the same thing! Hope this helps!

7 0

3 years ago

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