Member: hectictar

Thank you!! I was worried I had made it more complicated than necessary. Also I said "to the grocery store and back twice " which would be 4 times he traveled it, oops haha.

hectictarMar 3, 2017

+9479

Here's how to do it.

Start by drawing your x axis and your y axis. It looks just like a big plus sign. The x axis is the horizontal line. The y axis is the vertical line. The point where the two lines cross is the origin.

Draw some short tick-marks on your axes.

Label your tick marks.

On the y axis:

the tick marks above the x axis count up from 0 starting at the origin.

the tick marks below the x axis count down from 0 starting at the origin.

On the x axis:

the tick marks to the right of the y axis count up from 0 starting at the origin.

the tick marks to the left of the y axis count down from 0 starting at the origin.

Now put your pencil on the origin. Move your pencil straight down 9 tick marks. Draw a dot here.

Now put your pencil on the dot you just made. Move the pencil up 3 tick marks, then move it left 1 tick mark. Now draw a dot at that point.

Next, connect your two dots with a straight line.

Next, give yourself a pat on the back because you have just graphed y=-3x-9 !!!!!!!! :) :) :) :)

hectictarMar 3, 2017

+9479

http://web2.0calc.com/questions/pie_16862

Check it out Davis :)

(Apparently that dude made an account but at the time of posting was a guest)

hectictarMar 3, 2017

+9479

I honestly forgot how to to this so I had to refresh my memory with this website.

http://www.purplemath.com/modules/fromzero.htm

I'm sure it can explain how to do these better than I can. :)

y = a[x - (1+√2)][x - (1 - √2)]

y = a[x - 1 - √2][x- 1 + √2]

y = a(x² - x + √2(x) - x + 1 - √2 - √2(x) + √2 - 2)

y = a(x² - 2x - 1)

Since the y-intercept is -4, x is 0 when y is -4. Use this information to find a.

-4 = a(0² - 2(0) - 1)

-4 = a(-1)

4 = a

y = 4(x² - 2x - 1)

y = 4x² - 8x - 4

Or you could say:

f(x) = 4x² - 8x - 4

-----------------------------------------------------

The zeros are at x = 2 and x = 4.

y = a(x-2)(x-4)

y = a(x² - 6x + 8)

y is -2 when x is 3

-2 = a(3² - 6(3) + 8)

-2 = a(9 - 18 + 8)

-2 = a(-1)

2 = a

y = 2(x² - 6x + 8)

y = 2x² - 12x + 16

Or you could say:

f(x) = 2x² - 12x + 16

hectictarMar 3, 2017

+9479

arctan(0.59) ≈ 30.541º

arctan(0.59) ≈ 0.533 rad.

hectictarMar 3, 2017

+9479

If 8 packages cost $5.89, then one package costs $5.89/8 = $0.73625

The total price equals the number of packages you bought times the price of each package.

$28.62 = number of packages*$0.73625

$28.62/$0.73625 ≈ 38.873 packages

This seems off though because what store charges 73.625 cents for packs of hamburger meat?

74 cents makes the price for 8 packs too high and 73 cents makes the price for 8 packs too low. 73.6 cents works but that still is a fraction of a cent.

On top of that who buys 38.873 packages? Oh well.

hectictarMar 3, 2017

+9479

$2^{2n} = \frac{1}{64} \\ 2^{2n} = \frac{1}{2^{6}} \\ 2^{2n} = 2^{-6} \\ 2n = -6 \\ n = -3$

hectictarMar 3, 2017

+9479

2020

hectictarMar 3, 2017

+9479

+11

His average speed will be the total distance he traveled divided by the total amount of time it took him.

Find his total distance:

12 minutes is 12/60 hours, or 0.2 hours.

He went 15 mph for 0.2 hours, so the distance to the grocery store is 15(0.2) = 3 miles.

He went to the grocery store and back twice so his total distance was 3(2) = 6 miles.

Find his total time:

The first trip was 12 minutes.

He went twice as fast on the second trip so his time will be half as much. 12/2 = 6 minutes.

His total time is 12 + 6 = 18 minutes.

Average speed = 6 miles / 18 minutes

Average speed = 1/3 miles per minute.

Average speed = 20 miles per hour.

hectictarMar 3, 2017

+9479

(2 + 7.75/12)(36 + 8/12)

= (127/48)(110/3)

= 13970/144

= 6985/72 feet²

≈ 97.01 feet²

hectictarMar 3, 2017

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