Question

Question:
http://prntscr.com/kprwyc
Answer choices:
http://prntscr.com/kprx41
http://prntscr.com/kprx6p
http://prntscr.com/kprx9z
http://prntscr.com/kprxdh

Answer 1

@Vocaloid

Answer 2

the inverse of a graph should be reflected about the y=x axis

Answer 3

any guesses?

Answer 4

C?

Answer 5

close, it's the other one, A :)

Answer 6

okay got it

Answer 7

http://prntscr.com/kps2o0

Answer 8

@photonics

Answer 9

@Vocaloid

Answer 10

start from the inside of the parentheses and work your way out

so find g(1) by plugging in x = 1 into 2x - 3
then take the result from that and plug that into 5x

Answer 11

can you walk me thru it please?

Answer 12

g(1) means plug in x = 1 into g(x)

so g(x) = 2x - 3 = 2(1) - 3 = ?

Answer 13

because I see f(g) but not f(x)

Answer 14

1

Answer 15

I got 1 as my answer

Answer 16

check your signs again

2(1) - 3 = 2 - 3 which is -1 not 1

so g(1) = -1, we plug this into f(x) = 5x

giving us f(g(1)) = -5 = your solution

Answer 17

http://prntscr.com/kps759

Answer 18

so we plug the entire expression for g(x) into the x for f(x)

so f(x) = 3x + 2, then f(g(x)) = 3(x-5) + 2 = ?

Answer 19

B

Answer 20

good

Answer 21

http://prntscr.com/kps8ek

Answer 22

so switch y and x, then re-solve for y

basically

x = (4/3)y

then solve for y

Answer 23

B

Answer 24

good

Answer 25

is this correct?
http://prntscr.com/kpsava

Answer 26

yea good

Answer 27

http://prntscr.com/kpsb01

Answer 28

good

Answer 29

http://prntscr.com/kpsbq0

Answer 30

good

Answer 31

http://prntscr.com/kpsc11

Answer 32

be careful w/ question 7, x^3 / x is x^2 not x^3

Answer 33

question 8 is correct

Answer 34

oh its b my bad

Answer 35

http://prntscr.com/kpsczq

Answer 36

the y-axis is the straight vertical line that splits the graph into left and right halves

Answer 37

U

Answer 38

good

Answer 39

http://prntscr.com/kpsdev

Answer 40

so the trick for these is to reverse the coordinates and see which points are on the existing graph

so reversed, the coordinates are
(0,4)
(2,0)
(0,-2)
(4,0)

see which one(s) are on the existing graph

Answer 41

0,4

Answer 42

good but there's one more point

Answer 43

2,0 i thinkk

Answer 44

good so we reverse the coordinates again to get the actual answer

so (4,0) and (0,2) are your solutions (the first two checkboxes)

Answer 45

http://prntscr.com/kpsfu7

Answer 46

any ideas? how many units left and down do we go?

Answer 47

* from the origin

Answer 48

B

Answer 49

good

Answer 50

http://prntscr.com/kpsg0n

Answer 51

any ideas? notice how x = -1 has two different assigned values -3 and 1

Answer 52

hmm im not that sure I usually dont know how to answer these questions

Answer 53

well to be a function, each x would only have 1 assigned value

so it's not a function, but it ~is~ a relation

so A would be the best solution

Answer 54

okay getting it slowly

Answer 55

http://prntscr.com/kpsgef

Answer 56

any ideas? do any of the x values match w/ multiple y's?

Answer 57

this is not a function

Answer 58

hm not quite

since each x only connects to one y-value this is both a function + a relation

Answer 59

Oh I got mixed up

Answer 60

http://prntscr.com/kpsi33

Answer 61

so there's this thing called the vertical line test, if you can draw a vertical line somewhere that crosses the graph more than once, it's not a function

otherwise its a function

Answer 62

Its a function

Answer 63

good so both function + relation

Answer 64

http://prntscr.com/kpsiv9

Answer 65

any ideas? as a hint, at each time you can only have one distance traveled

Answer 66

A function only?

Answer 67

generally all functions are relations so both

Answer 68

http://prntscr.com/kpsiyo

Answer 69

any ideas? as a hint the y-value is just the x value times 5

Answer 70

C?

Answer 71

good

Answer 72

http://prntscr.com/kpskkn

Answer 73

well

y = mx + b is the general form where b is the y-intercept

so since the y-intercept is 3 which one might be the best option?

Answer 74

D?

Answer 75

not quite, the intercept is positive 3 not negative 3 so C is the better option

Answer 76

the y-axis is the one that goes vertical/up and down

Answer 77

got it
http://prntscr.com/kpsm9b

Answer 78

hm, so independent is the one that influences/determines the other, and the dependent is entirely dependent on the independent

so that being said, does your speed determine the time or does the time spent walking determine the speed?

Answer 79

C

Answer 80

be careful, "time of day" is not one of the variables

the dependent variable to complete the walk (A)

Answer 81

oh I went for the wrong one
http://prntscr.com/kpsmxz

Answer 82

dependent is usually y, just gotta know this

Answer 83

oh okay good 2 know

Answer 84

so its going to be B

Answer 85

yes

Answer 86

http://prntscr.com/kpsnze

Answer 87

domain is x so just list all the x-values and stick them in brackets

Answer 88

B

Answer 89

good, B

Answer 90

http://prntscr.com/kpspdt

Answer 91

not quite, range would be the f(x) column

Answer 92

its D

Answer 93

or B

Answer 94

hm not quite, f(x) has the values 5, 10, 15, 25 so B is the better option

usually we list the range values in order regardless of how they appear

Answer 95

Ohhh okay

Answer 96

http://prntscr.com/kpspj3

Answer 97

f(4) means the value of f(x) when x = 4

so go to x = 4 into the table and see what the f(x) value is

Answer 98

C?

Answer 99

yup good 5

Answer 100

http://prntscr.com/kpsqik

Answer 101

similar logic , find x = 2 and find the matching function value

Answer 102

B

Answer 103

good

Answer 104

http://prntscr.com/kpsqsn

Answer 105

just gotta plug in x = 5 into (1/3)(5 - 4x)

be careful w/ order of operations.

Answer 106

D

Answer 107

good

Answer 108

Question:
http://prntscr.com/kpss8z
Answer Choices:
http://prntscr.com/kpssdt

Answer 109

C?

Answer 110

hm not quite. c doesn't work b/c (-4,4) is not on the graph

if we look at the graph we can see (-2,-5) and (-1,-2), right? so what might the best solution be?

Answer 111

B

Answer 112

good

Answer 113

Question:
http://prntscr.com/kpstaf
Answer Choices:
http://prntscr.com/kpsteb
http://prntscr.com/kpstgo
http://prntscr.com/kpstiv
http://prntscr.com/kpstl0

Answer 114

any ideas? as a hint these are the same points that were on the last question

Answer 115

B

Answer 116

good

Answer 117

http://prntscr.com/kpstvf

Answer 118

just gotta add them together

x + 11 + x - 7 = ?

Answer 119

C

Answer 120

good

Answer 121

http://prntscr.com/kpsuom

Answer 122

we subtract them this time, taking care of signs

10x + 2 - (-8x + 5) = ?

Answer 123

C again

Answer 124

good

Answer 125

http://prntscr.com/kpsv77

Answer 126

I know im tiring you almost done I appreciate it

Answer 127

2x^3 * (x^2 + 6x) = ?
be careful w/ exponents and parentheses

Answer 128

D

Answer 129

yup good

Answer 130

http://prntscr.com/kpsvos

Answer 131

divide this time

5x^6 / (15 x^(-2)) = ?

Answer 132

hmm A or C not sure

Answer 133

A i think

Answer 134

yup, A since 6 - (-2) = 8

Answer 135

http://prntscr.com/kpswy8

Answer 136

A?

Answer 137

yup

Answer 138

Question: http://prntscr.com/kpsx60
Answer choices:
http://prntscr.com/kpsxco
http://prntscr.com/kpsxfy
http://prntscr.com/kpsxie
http://prntscr.com/kpsxl5

Answer 139

the trick for these is to draw the line y = x and reflect across that

Answer 140

so something like that purple line should be the inverse

Answer 141

so C

Answer 142

the inverse still has to cross (1,1) so this one is a better choice

Answer 143

Ohh okay

Answer 144

http://prntscr.com/kpsy57

Answer 145

this one requires a bit of calculation

for each function we need to take the value of g(x) and plug it into the x-value of f(x) and see which one produces the desired result

start w/ A

f(x) = 2x + 3
g(x) = 4x - 1

f(g(x)) = 2(4x-1) + 3 = ?

Answer 146

A because it then equals 8x+1

Answer 147

good

Answer 148

http://prntscr.com/kpt0hs

Answer 149

B?

Answer 150

not quite. first we swap the x and y to get

x = 5y + 6

then solve for y

Answer 151

A

Answer 152

good

Answer 153

http://prntscr.com/kpt16h

Answer 154

one more after this

Answer 155

this is a tricky question

the function gives the amount of battery ~left~ not the amount of battery needed

so none of these would be the best imo

Answer 156

Last one:
http://prntscr.com/kpt27j

Answer 157

"before he started" a.k.a month 0

how much did have at month 0?

Answer 158

100

Answer 159

good so 100 = your solution

Answer 160

I got 1 wrong Thanks soooo much tho Voca

Answer 161

this is the question I got wrong: http://prntscr.com/kpt342

Answer 162

huh. interesting. idk why it wouldn't be a function though