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kkurt [141]
3 years ago
7

Show work and answer please

Mathematics
1 answer:
creativ13 [48]3 years ago
5 0
6r + 7= 13 + 7r
6r - 7r = 13-7
-r = 6
r=-6
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The cost of holding a children's birthday party at a rollerskating rink is a function of n, the number of people in the party. T
Bas_tet [7]

Answer: It would cost $150 for a party of 9 people and it would cost $260 for 20 people

Step-by-step explanation:

The number 9 falls in between 0<n<_ 12 so the cost is 150

The number 20 falls in between 12<n<_ 20 so the cost is 260

4 0
2 years ago
For the circle x^2 + y^2 = 100, a) State the radius at 6,8
alexandr1967 [171]

Answer:

add multiply divide or subtract make sure to use Pemdas then and you should have your answer

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
If you have a bag that contains 24 marbles: 4 red, 12 blue, 6 black, 2 green. what is the probability of randomly picking one ma
seropon [69]

24 total marbles

6 are black

 so you have a 6/24, reduced to 1/4 probability of picking a black one.

4 0
3 years ago
Please help asap find f -1
ExtremeBDS [4]
I.
Given a function f with domain D and range R, and the inverse function 
f ^{-1},

then the domain of f ^{-1} is the range of f, and the range of f ^{-1} is the domain of f.

II. We are given the function f(x)= \sqrt{x-5},

the domain of f, is the set of all x for which \sqrt{x-5} makes sense, so x is any x for which x-5\geq0, that is x≥5.

the range is the set of all values that f can take. Since f is a radical function, it never produces negative values, in fact in can produce any value ≥0

Thus the Domain of f is [5, ∞) and the Range is [0, ∞)
then , the Domain of f ^{-1} is [0, ∞) and the Range of f ^{-1} is [5, ∞) 

III.
Consider f(x)= \sqrt{x-5}

to find the inverse function f^{-1}, 

1. write f(x) as y:

y= \sqrt{x-5}

2. write x in terms of y:

y= \sqrt{x-5}

take the square of both sides

y^{2} =x-5

add 5 to both sides

y^{2} +5=x

x=y^{2} +5

3. substitute y with x, and x with f^{-1}(x):

f^{-1}(x)=x^{2} +5


These steps can be applied any time we want to find the inverse function.

IV. Answer: 

f^{-1}(x)=x^{2} +5, x≥0

y≥0, where y are all the values that f^{-1} can take

Remark: the closest choice is B

8 0
3 years ago
PLEASE HELP ME ASAPPPPP
tester [92]

Answer:

One solution

Step-by-step explanation:

Move variables to one side and constants to the other.

x-4y=-1

2x+8y=8 Divide this by 2

x+4y=4

Add the equations

2x=-3

x=-1.5

y=-1/8

5 0
3 years ago
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