Question

evaluate each expression for the given values of the variables. 16.) k=-1 and n=-2
-ksquared-(3k-5n)+4n

Answer 1

replace every k with -1 (since k = -1) and replace every n with -2 (since n = -2)

Answer 2

so

-k^2 - (3k - 5n) + 4n

-(-1)^2 - (3(-1) - 5(-2)) + 4(-2)

evaluate that and simplify

Answer 3

tell me what you get

Answer 4

the next line after the line u gave was 1^2(-3+10)+-8
next line I got 1(7)+-8 next line I got 7+-8=answer -1 did I msss up anywhere????? those are what I got after your two lines given

Answer 5

-k^2 - (3k - 5n) + 4n

-(-1)^2 - (3(-1) - 5(-2)) + 4(-2)

-(1) - (-3 + 10) - 8

-1 - (7) - 8

-1 - 7 - 8

-8 - 8

-16

hopefully you can spot your error

Answer 6

i didn't catch my error but thanks for the step by step help

Answer 7

could you help with more please?

Answer 8

your error is that you had 1(7)+-8 when it should have been -1 - (7) +- 8

Answer 9

oh ok. thanks wll ou help with more algebra two problems please...????? r u good at story problems i have 6 in a row and don't have the fanest idea how to do them

Answer 10

and I can help with a few more

Answer 11

I'll help with a few, but 6 sounds like a lot

Answer 12

we'll see how it goes

Answer 13

32.) think about a plan..... Tran's truck gets very poor gas mileage. if tran pays $84 to fill his truck with gas and is able to drive m miles on a fulltank, what expression shows his gas cost per mile?????? what operation does "per" indicate???? check your expression by substituting 200 miles for m. does your answer make sense??????

33.) suppose you need to subtract a from b but mistakenly subtract b from a instead. how is the answer you get related to the correct answer? explain.

Answer 14

ok let's focus on #32 first

Answer 15

it costs $84 to fill up the tank completely

and he's able to drive m miles on this full tank

so this means that it costs him $84 to drive m miles

Answer 16

the word "per" means "divide"

eg: miles per hour = miles/hour

Answer 17

so when they say "cost per mile" they mean

cost/mile = $84/m = 84/m

Answer 18

i only have 4 story problems not 6

Answer 19

so the cost per mile is 84/m

Answer 20

so for instance, if he can drive 84 miles on a full tank, then m = 84 and

84/m = 84/84 = 1

which means that the cost per mile is $1 per mile, ie it costs $1 to drive 1 mile

Answer 21

what happens when m = 200?

Answer 22

84/200?

Answer 23

which reduces to what

Answer 24

50/21?

Answer 25

you have it flipped and it should be 21/50

Answer 26

now convert that to decimal form

Answer 27

your going really fast. and all the messages at once are confusing. idk what to write for my work or answers on 32 sorry but im a slow learner. im a lil lost.. can u start over explaining one message at a time so i get it???????????????/

Answer 28

you saw how I got 84/m right?

Answer 29

84 to fill up tank of gas. m stands for number of miles driven. do i write down 84/m irst on my paper?

Answer 30

that's the expression for the cost per mile, so yes

Answer 31

k got it

Answer 32

now you replace m with 200 to get

84/m = 84/200 = 21/50 = 0.42

you use a calculator to convert to decimal form (or you can use long division)

this means that it costs him $0.42 or 42 cents to drive one mile

so if he can go 200 miles on a full tank of gas, then it costs 42 cents per mile

Answer 33

whered you get 84/200? 21/50? 0.42?

Answer 34

in the instructions, it says to use m = 200

it says "check your expression by substituting 200 miles for m"

Answer 35

ok got it

Answer 36

84/200 then reduces to 21/50

you use a calculator to get 21/50 = 0.42

Answer 37

21/50 you reduced to get thatoooookk think i ot it

Answer 38

thanks!! now, what would i exactly circle for my answers? it had several answer questions

Answer 39

you would circle 84/m and 0.42

oh and don't forget to say whether the answer of 0.42 makes sense or not

Answer 40

i have four circles. 84/m. 0.42. makes sense. per means divide.. am i right only four circles?

Answer 41

so far I'd say 2 or 3 for #32

Answer 42

oh wait! what expression shows his gas cost per mile???

Answer 43

84/m

Answer 44

do i have every answer circled? i said two messages up what i circled

Answer 45

yes it sounds like you got everything covered

Answer 46

thank u soooo much for your help sir.33? 34? 35? got time to help with 3 or a couple after that more? I REALLY do appreciate it (=

Answer 47

sure we can do 3 more

Answer 48

33 i typed above with 32 already

Answer 49

33.) suppose you need to subtract a from b but mistakenly subtract b from a instead. how is the answer you get related to the correct answer? explain.

Answer 50

THANK YOU SOOOO MUCH sir(; your my savior

Answer 51

it's best to do some examples

Answer 52

pick any two different numbers you want

Answer 53

examples then you will help with my homework?????

Answer 54

this is helping, it will help you see how to answer

Answer 55

go ahead and pick any two numbers you want

Answer 56

34 and 35 ok? they are story problems?

Answer 57

no not problem numbers, I meant any two numbers you can think of for #33

Answer 58

2 and -4

Answer 59

ok for now, let's keep them positive, so let's do 2 and 4

Answer 60

let a = 2 and b = 4

Answer 61

if a = 2 and b = 4

then what is a - b equal to?

Answer 62

-2?

Answer 63

good, now what is b - a using the same values for 'a' and 'b'

Answer 64

2

Answer 65

so to recap

a-b = -2

b-a = 2

Answer 66

ya?

Answer 67

let's pick another pair of numbers, say 7 and 10

if a = 7 and b = 10, then

a-b = -3
b-a = 3

Answer 68

see what's going on?

Answer 69

yes i do your picking easy ones

Answer 70

so in general, what's the connection between a-b and b-a

Answer 71

its the same answer. just when you take b-a it equals a negative integer

Answer 72

instead of a positive integer

Answer 73

good, so if a-b is a negative number then b-a is the positive version of that number

OR

if a-b is a positive number, then b-a is the negative version of that same number

Answer 74

that's the answer yay! we are two smart cookies teamwork

Answer 75

right? your last message is the answer?

Answer 76

lol so if you subtract in the wrong order and you know the answer has to be positive, then you can just drop the negative sign

Answer 77

yes pretty much

Answer 78

another way to put the answer: the two expressions a-b and b-a are equal in absolute value since they both produce the same result if you ignore the positive and negative signs

Answer 79

that answer sounds super smart your last message thnks a billion. but PLEASE don't leave yet

Answer 80

alright

Answer 81

for numbers 34 and 35 write an algebraic expression to model each situation. Thank u soooo much for your help btw i really do appreciate it

Answer 82

34.)jobs... you have a summer job at a car wash. you earn $8.50 per hour and are expected to pay a one-time fe of $15 for he unifom. If you work x hours per week, how much will you make durng the first week?????????????

35.)class project.. the frshman class will be selling carnations as a class project. what is their income after they pay the florist a flat fee of $200 and sell x carnations for $2 each.

name the property of real numbers illustrated by the equation
44.)2(s-t)=2s-2t 46.) -(2t-11)=11-2t simplify each expression 56.) 4x+3x-4 58.) -2(4+b)+4(b-5)

Answer 83

were you able to get anywhere with #34

Answer 84

$8.50ph+$15=xh per week=? something like that?

Answer 85

close

Answer 86

if you work for x hours per week and you earn $8.50 an hour, then you earn 8.50x dollars for working those x hours


subtract off the 15 dollars you have to pay for the uniform to get 8.50x - 15

Answer 87

so you will make 8.50x - 15 dollars

Answer 88

if it told you how many hours a week you worked that first week, then you could find an actual number for the answer

Answer 89

there isn't a actual answer number? just the algebraic expression?

Answer 90

yes because it doesn't say how many hours as week you worked

Answer 91

it just says "x hours"

Answer 92

i get it how u explained it. i wish u was my teacher whoever u may be

Answer 93

thanks

Answer 94

if it said you worked 40 hours that first week, then you'd replace x with 40 and evaluate

Answer 95

how many $ signs are in the answer 2 isn't it?

Answer 96

what do you mean

Answer 97

I think you mean decimal places right?

Answer 98

no $ signs dollar signs