Question

Anybody willing to help me with three easy questions please! I will fan and medal and love you forever <3

Answer 1

If h(x) = 4x − 8 and j(x) = −x, solve h[j(3)] and select the correct answer below.
A. −36
B. −20
C. 1
D. 4

Answer 2

a) what is \(j(3)\)?

Answer 3

J is -x and 3 is just 3.... wait are u asking me or are you confused? :)

Answer 4

satellite73 knows the answer

s/he is asking you to see if you know it

Answer 5

\[j(x)=-x\] so
\[j(\spadesuit)=-\spadesuit\] and \[j(\xi)=-\xi\] so what is \[j(3)\]?

Answer 6

Oh ok... Yes so I did 4x-8[-x(3)] but i keep getting 28

Answer 7

umm... -3?

Answer 8

j(3) is -3, yes

Answer 9

ok thanks

Answer 10

whew
b) what is \(h(-3)\)?

Answer 11

notice how satellite73 replaced the "j(3)" with "-3"

going from h[ j(3) ] to h(-3)

this only works because j(3) = -3

Answer 12

4x+24?

Answer 13

replace every x in h(x) = 4x − 8 with -3

Answer 14

oh ok so 4(-3) or -12 -8?

Answer 15

\[h(\diamondsuit)=4\times\diamondsuit-8\]\[h(\Phi)=4\times \Phi -8\]\[h(-3)+?\]

Answer 16

yeah just compute -12-8

Answer 17

-20

Answer 18

correct

Answer 19

omg tysm!!

Answer 20

I need help with 2 more... please

Answer 21

go ahead

Answer 22

Ray is purchasing a laptop that is on sale for 25% off. He knows the function that represents the sale price of his laptop is c(p) = 0.75p, where p is the original price of the laptop. He also knows he has to pay 8% sale's tax on the laptop. The price of the laptop with tax is f(c) = 1.08c, where c is the sale price of the laptop.

Determine the composite function that can be used to calculate the final price of Ray's laptop by solving for f[c(p)].

A. f[c(p)] = 1.83p
B. f[c(p)] = 1.83cp
C. f[c(p)] = 0.81p
D. f[c(p)] = 0.81cp

Answer 23

\[\Large f(c) = 1.08c\]
\[\Large f(\color{red}{c}) = 1.08\color{red}{c}\]
\[\Large f(\color{red}{c}) = 1.08(\color{red}{c})\]
\[\Large f(\color{red}{c(p)}) = 1.08(\color{red}{c(p)})\]
\[\Large f(\color{red}{c(p)}) = ??\]

Answer 24

um...

Answer 25

\[\Large f(c) = 1.08c\]
\[\Large f(\color{red}{c}) = 1.08\color{red}{c}\]
\[\Large f(\color{red}{c}) = 1.08(\color{red}{c})\]
\[\Large f(\color{red}{c(p)}) = 1.08(\color{red}{c(p)})\]
\[\Large f(\color{red}{c(p)}) = 1.08(\color{red}{0.75p})\]
\[\Large f(\color{red}{c(p)}) = ??\]
In the second to the last step, I replaced c(p) with 0.75p because c(p) = 0.75p

Answer 26

0.81

Answer 27

0.81p

Answer 28

don't lose the p

Answer 29

the c or c(p) goes away because it is replaced by 0.75p

Answer 30

oh ok got it so c right

Answer 31

yes

Answer 32

The following table shows the length and width of two rectangles:


Length Width
Rectangle A 2x + 8 x − 1
Rectangle B 3x + 5 2x − 2


Which expression is the result of the perimeter of rectangle B minus the perimeter of rectangle A?
A. 2x − 4
B. 8x + 10
C. 16x + 20
D. 4x − 8

Answer 33

Thank you! Last question

Answer 34

hint:

Perimeter = 2*(Length + Width)

Answer 35

ok so, 2*(2x+8)+(x-1) for the first one right?

Answer 36

2*[ (2x+8)+(x-1) ] actually

Answer 37

oh ok now what? when i simplify it i get 5x+15

Answer 38

you should get 2*(3x+7) = ???

Answer 39

ohh i see! ok so 6x+14?

Answer 40

yes, that is the perimeter of rect A

Answer 41

find the perimeter of rect B

Answer 42

so for rectangle B would be 2*[ (3x+5)+(2x-2) ]

Answer 43

yes

Answer 44

I'll be right back

Answer 45

ok

Answer 46

is the answer 10x+6

Answer 47

perimeter of rect A = 6x+14
perimeter of rect B = 10x+6

Answer 48

subtract the two perimeters

Answer 49

Well the directions say "perimeter of rectangle B minus the perimeter of rectangle A" but when i do that i get 4x+8 which is none of the options

Answer 50

10x - 6x = 4x ... correct

6 - 14 = 8 ... incorrect

Answer 51

Now I'm confused

Answer 52

B - A = (10x+6) - (6x+14) = 10x + 6 - 6x - 14 = ??

Answer 53

i got 4x+20

Answer 54

Did you mean to put 10x + 6 - 6x + 14 = ?

Answer 55

no the negative distributes through

Answer 56

- (6x+14) = -6x-14

Answer 57

oh ok so it would be the last one right?

Answer 58

yeah 4x-8

Answer 59

Thank you so much!!!!!!!!

Answer 60

no problem

Answer 61

0