Desmos

Key words: Sphere, Diameter = 13, volume

What formula are we using? hint* what shape did we discover in key words and what is it asking us to find?

r = radius how do you find the radius?

• 1,150

• 863

• 6902

• 9203

Tags

CCSS.8.G.C.9

CCSS.HSG.GMD.A.3

Key words: greatest to least

Use Desmos to find the answer.

example: x = 39/8

put the other values in on their own line and the compare the lines.

If you cannot see the lines then zoom in until those lines separate.

• 39/8, 4.84, √24

• √24, 39/8, 4.84

• 39/8, √24, 4.84

• 4.84, 39/8, √24

Tags

CCSS.8.NS.A.2

Keywords: linear relationship, Slope intercept form,

Desmos: open up a table, put in the first two set of numbers and then use the formula

the original formula is y = mx+b

The desmos formula you add a 1 after the y and after the x and change the equal sign to a ~

• -3x, -2

• 4/3x, 8

• 4/3x, 2

• 3/4x, 2

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

Keywords: linear relationship,

How many did he have to start? Start means you are looking for ___?

m or b?

Desmos: use the table

put in the first two set of numbers

use the formula for desmos

Y=mx+b

y1~mx1+b

• 3

• 9

• 13

• 15

Tags

CCSS.HSF.LE.B.5

Key words: linear equation, what is the value of X?

just write out the equation and put it into desmos

you have two x's so you start with _x

then you have 5 positive 1s which is +_

on the other side of the equal sign you have 3 negative x's which is -_x

then you have 8 positive 1s which is +_

now write it out

_x+_ = -_x +_ change your x to your initial (no x or y) and use ~ instead of =

• 3/5

• -5/3

• -3/5

• 5/3

Tags

CCSS.7.EE.B.4A

Key words: right triangle

Roof is the "diagonal" which is the "hippo" Hypotenuse

which theorem are you using?

Desmos = a²+b²=c²

You have both legs so you would put into Desmos _²+_²~c²

• 5.1

• 16.1

• 26.0

• 19.7

Tags

CCSS.8.G.B.7

keywords: determine if it is a right triangle

You could:

find the sum of a²+b²

find the sum of c²

if both sums match it is a right triangle

You could also use desmos put your two smallest numbers in the equation

6²+8²~c² desmos will give you the C and if it matches the C on the test its a right triangle

which two are right triangles?

• 6,8,9

• 10,24,26

• 24,45,51

Tags

CCSS.8.G.B.8

Key words: proportional relationship

Using desmos put in the equation just the way you see it.

example: on desmos put y=x+15 and you will see that it gives you a line on the graph. you are looking for the equation that gives you a line that crosses through the center of origin (0)

• y=x+15

• y=x/2

• y=2(x=4)

• y=5

Tags

CCSS.8.EE.B.5

key words: cone, radius = 12, height = 18

volume of cone

what formula are you using? 1/3Bh where B is the area of a circle because the base of the cone is a circle

area of a circle is πr²

replace the B with πr²

desmos: 1/3πr²h

you are going to get 2714.336 notice how that answer is not there and in your answer choices you can still see pi.

This means that you will have to take pi out of the equation on desmos to get your answer.

or you can go through every answer and multiply it by pi and see if it matches your answer on desmos

for example 864 times π = 2714.336

• 2,592π

• 144π

• 864π

• 1,296π

Tags

CCSS.8.G.C.9

CCSS.HSG.GMD.A.3

Key words: Delivery fee (remember anytime you see "Fee" it means b)

your x = cookies

y= charge in dollars

write out ordered pairs (12,20) and (18, 27.50)

notice that your answer is written in y intercept form y=mx+b

using desmos get a table

put in your first two sets of numbers

then put in your formula y1~mx1+b hint: (you know your b is the fee)

• y=1.25x+5

• y=5x+1.25

• y=1.25x+6

• y=5x+7.50

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2