Question

The volume of many types of three dimensional shapes can be found by using the formula V = 1/3Bh where B stands for the area of the B and h stands for the height. Solve the formula for B.

Answer 1

help please

Answer 2

how would you move that 3 over

Answer 3

multiplying ?

Answer 4

idk to be honest

Answer 5

multiplying both sides by what

Answer 6

Bh

Answer 7

but you want to undo that division by 3

Answer 8

so you multiply by 3

Answer 9

yes giving you

3V = Bh

Answer 10

that's not right

Answer 11

well yeah, we're not done

you need to fully isolate B

Answer 12

"solve for B" means "isolate B"

Answer 13

right and how do you isolate it ?

Answer 14

divide?

Answer 15

both sides by what

Answer 16

3V

Answer 17

that just gives you

1 = (Bh)/(3V)

which is a step in the wrong direction when it comes to isolating B

Answer 18

we want B all by itself on its own side

Answer 19

so do u divide by Bh or 1/3 ?

Answer 20

go back to 3V = Bh

Answer 21

how do you move that h over

Answer 22

divide it by the other side

Answer 23

good, so you would get \[\large B = \frac{3V}{h}\]

Answer 24

thanks!!! :)

Answer 25

yw

Answer 26

can u help me with this ? Jena has a cell phone plan that charges a $30 flat fee for the service and then charges $0.25 for every minute that she uses the phone over 500 minutes. If "m" stands for the TOTAL number of minutes that she uses in a month and that amount is over 500 minutes, write the algebraic expression that shows how much she will be charged this month. Do not simplify or include the $ symbol in your expression.

Answer 27

how far did you get

Answer 28

well I had an answer but, it wasn't right.

Answer 29

could u help me out

Answer 30

are u there ???

Answer 31

what answer did you get

Answer 32

30 + 0.25M - 500/0.25
(30 - 125) + 0.25M
0.25M - 95

Answer 33

I did this

Answer 34

well you're charged $30 no matter what, so that gets added on first

then you're charged an additional $0.25 per min every min over 500, so you have to add on 0.25(m-500)

so the expression is


30 + 0.25(m-500)


and you can simplify that out if you want, but you can leave it like that

Answer 35

oh wait, it tells you not to simplify, so leave it like that

Answer 36

0.25(m-500) +30 This is the right answer You had it out of order

Answer 37

but thanks

Answer 38

oh same thing

Answer 39

since x+y is the same as y+x

Answer 40

yes true lol

Answer 41

The population of a town in Iowa is growing and the equation that displays the current population can be shown by the equation C = P(1.04)y where F stands for the current population, P is 124,000 and y stands for 12. What is the value of C? Write the number only.

Answer 42

how would you do this ???

Answer 43

plug in each value and evaluate

Answer 44

is this right so far C=124,000(1.04)12

Answer 45

good, now evaluate 124000*(1.04)^12

Answer 46

I square the 12 ? or multiply it

Answer 47

type what you see exactly into your calculator

Answer 48

am I supposed to get a big number ?

Answer 49

show me what you got

Answer 50

18570240

Answer 51

a bit too big

Answer 52

type

124000*(1.04)^12

into google (copy and paste)

Answer 53

it will act like a calculator and give you the result

Answer 54

198527.995102

Answer 55

I got this

Answer 56

much better

Answer 57

you round to the nearest whole number since this is a population of people (and you can't have half a person)

Answer 58

how am I supposed to round that big number ?

Answer 59

look at the decimal point, what's to the right of it?

Answer 60

a 9

Answer 61

so you round up

Answer 62

that's bigger than 5, so you chop everything off after the decimal point and you add 1 to the number to go from 198527 to 198528

Answer 63

yep round up

Answer 64

can u help me with line of best fit

Answer 65

sure, but this will be the last one for today

Answer 66

Year 1900 1920 1940 1960 1980 2000 2010
Price 0.28 0.66 0.34 0.49 2.16 1.51 2.80

Answer 67

What is the equation for the line of best fit for this data? All number should be to 3 decimal places and no spaces for the auto grade to work correctly

Answer 68

hopefully you can use a calculator for this

this is because doing regression lines by hand is a bit of a pain

Answer 69

do you have a TI calculator?

Answer 70

yes I do u put the data in Stat don't u

Answer 71

yes correct, you put the data into 2 lists

Answer 72

then you do a regression

Answer 73

okay it shows me the LineReg it has a,b, r^2 and r.. which one is the equation

Answer 74

the equation is most likely y = a + bx

so you plug in the values you got for a and b

Answer 75

it doesn't say the equation I have to create it

Answer 76

what are the values of a and b

Answer 77

a= .0203626062
b= -38.70447592

Answer 78

I'm getting the same roughly

Answer 79

round that to 3 places to get a = 0.020 and b = -38.704


so your equation is

y = 0.020x - 38.704

Answer 80

thanks so much

Answer 81

np

Answer 82

are you a teacher ?

Answer 83

not yet, I'm learning to become one at the moment

Answer 84

ohh that's cool what math are you going to teach ?

Answer 85

I'll probably teach high school math or middle school math

Answer 86

good luck with that! I have one more question sorry but, I don't know how to do this ?Use the line of best to determine what the cost of milk will be in 2020. Round your answer to the nearest hundredth

Answer 87

the equation is y = 0.020x - 38.704 where x is the year

so plug in x = 2020 and evaluate to get your answer (remember to round your answer to 2 decimal places)

Answer 88

ok but where do you plug in the 2020 at ?

Answer 89

behind the 0.020x?

Answer 90

you replace x with 2020

Answer 91

so like this ? y=0.020(2020)-38.704 ??

Answer 92

correct, now evaluate that

Answer 93

I got 1.696

Answer 94

round that to 2 decimal places

Answer 95

1.700

Answer 96

so the answer is 1.70

Answer 97

it says its wrong.

Answer 98

hmm is it saying the equation y = 0.020x - 38.704 is wrong?