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Nady [450]
3 years ago
10

PLEASE HELP!!!!

Mathematics
2 answers:
KIM [24]3 years ago
7 0
1. 3rd one

2. f(x) = 7x - 5
    f(2) = 7(2) - 5
    f(2) = 14 - 5
    f(2) = 9

3. c(n) = 0.75n - 0.25

4. (0,0)(2,4)
    slope = (4 - 0) / (2 - 0) = 4/2 = 2
    answer is : y = 2x

charle [14.2K]3 years ago
5 0

<u>QUESTION 1</u>

y = x - 3


When



x=10, y=10-3=7



x=10, y=10-3=7 \\  \\ x=8, y=8-3=5 \\  \\ x=6, y=6-3=7






Hence the correct answer is C.



<u>QUESTION 2</u>

We have


f(x) = 7x - 5


To evaluate this function at


x = 2



We replace x with 2 in the given function to obtain,





f(x) = 7(2)- 5




We now simplify to obtain,




f(x) = 14 - 5 = 9



The correct answer is A.




<u>QUESTION 3</u>

If each candy is $0.75, then n pieces will be


$ 0.75n



If you have $0.25 off, then cost of n pieces of candy will be


$ c(n)= 0.75n - 0.25



The correct answer is B.



<u>QUESTION 4</u>


We have been given the ordered pairs,



(0,0),(2,4),(4,8),(6,12)



By inspection you can observe that,



x \rightarrow2(x)



Hence


y = 2x


Or we can alternatively use,





y = mx + c




and substitute any two points to find the constants.





When we substitute




(0,0)



We get



0 = m(0) + c




0 = 0 + c


which gives


c = 0


Our equation now becomes,



y = mx


We now substitute our second point, say



(2,4)


\Rightarrow 4 = 2m




\Rightarrow 2= m




Therefore,




The equation is



y =2x




Therefore the correct answer is D.

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