Week #25 Bell ringers & quiz

8th grade math

Bell RingerMonday

Admission to an amusement park is $18. Each ride is $1.50.

1. Write the equation that can be used to find the total cost, c, for x rides.

2. Calculate the cost to ride 10 rides.3. Calculate the cost to ride 35 rides4. Calculate the cost for family of 5 to ride 20 rides

each.

Admission to an amusement park is $18. Each ride is $1.50. 1. Write the equation that can be used to find the total cost, c,

for x rides.

2. Calculate the cost to ride 10 rides.

3. Calculate the cost to ride 35 rides

4. Calculate the cost for family of 5 to ride 20 rides each.

xc 5.118)10(5.118c 33$c

)35(5.118c 50.70$c

)]20(5.118[5 c240$c

In triangle ABC, the degree of angle A is 20o greater than the degree measure of

angle B. Angle C is a right angle. Calculate the measure of angle B.

Quiz Monday

What is the measure of angle B?

Since a triangle has 180 degrees, I subtracted the angle I knew from 180. I split the remainder evenly between the other two angles. Since angle A is larger than angle B by 20 degrees, I split the difference and added the extra 10 to A. I subtracted the 10 from B. I added the three angles together to check my answer.

I triangle ABC, the degree of angle A is 20o greater than the degree measure of angle B. Angle C is a right angle. Calculate the measure of angle B.

The measure of angle B is 35 degrees.

TriangleA = 20o > BC = 90o

o9090180 o452

90

o

B

351045

:

o180355590

o

A

551045

:

Bell RingerTuesday

1. Determine which consecutive integers is between AND Solve.

2. Write the expression that can be used to find the nth term of the sequence.

3, 7, 11, 15, ….3. Find the missing length of a right triangle

with sides: 12, 16, ? .

23

1. Determine which consecutive integers is between AND Solve.

2. Write the expression that can be used to find the nth term of the sequence.

3, 7, 11, 15, ….

3. Find the missing length of a right triangle with sides: 12, 16, ? .

23

252316 5234 8.423

14 n

222 1612 c2256144 c

2400 c2400 c

c20

n 1 2 3 4

term 3 7 11

15

Antonio and his two brothers equally shared the cost of a new TV with a list price of $750. They received a 30% discount off the list price and paid

8.25% sales tax on the discounted price. Find the approximate amount that each of the 3 brothers paid toward the cost of

the TV.

Quiz Tuesday

How much will each person pay?

To find the sales price, I multiplied the original cost by the percent actually paid (after converting to a decimal). To find the tax, I multiplied the tax percent and 100% of the cost by the sales price. To find the approximate cost for each, I divided the amount by 3 (after I rounded).

Antonio and his two brothers equally shared the cost of a new TV with a list price of $750. They received a 30% discount off the list price and paid 8.25% sales tax on the discounted price. Find the approximate amount that each of the 3 brothers paid toward the cost of the TV.

Each person will pay $190.

3 people split cost$750 original price30% off8.25% taxApproximate

525$)7(.750$ 31.568$)0825.1(525$

190$3

570$

)192189($

A bag contains 10 red tiles, 5 green tiles, and 4 blue tiles.

1. Write a ratio comparing red tiles to the total # of tiles.

2. Write a ratio comparing the number of non-red tiles to the total # of tiles.

10

19

red

to ta l

9

19

non red

to ta l

A bag contains 10 red tiles, 5 green tiles, and 4 blue tiles.

3. Calculate the mean.

4. Calculate the range.

QuizThursday

Two prisms are similar. The scale factor is 1/3. The volume of the larger prism is 81 cm3. Calculate the volume of the smaller prism.

What is the volume of the new prism?

I found the scale factor of the volumes by cubing the original scale factor. I used the scale factor of the volumes to set up a proportion with the known volume. Since the scale factor is less than 1, I knew we went from large to small. I solved the proportion by multiplying by 3 to get the volume of the smaller prism.

Two prisms are similar. The scale factor is 1/3. The volume of the larger prism is 81 cm3. Calculate the volume of the smaller prism.

The volume of the smaller prism is 3 cubic centimeters.

ReductionScale factor: 1/3Large volume = 81 cubic cm

Class Work: Theoretical & Experimental Probability

You need your notes. Title the notes: Theoretical & Experimental Probability

I will check your work at the end of class.

Bell RingerFriday

A bag contains 10 red tiles, 5 green tiles, 3 purple tiles, and 4 blue tiles.

1. What is the probability a red tile will be randomly picked from the bag?

2. What is the probability a green or blue tile will be randomly picked from the bag?

3. What is the probability a yellow tile will be randomly picked from the bag?

4. Calculate the mean.5. Calculate the range.

A bag contains 10 red tiles, 5 green tiles, 3 purple tiles, and 4 blue tiles.

1. What is the probability a red tile will be randomly picked from the bag?

11

5

22

10)( redP

A bag contains 10 red tiles, 5 green tiles, 3 purple tiles, and 4 blue tiles.

2. What is the probability a green or blue tile will be randomly picked from the bag?

22

9)( eGreenorBluP

A bag contains 10 red tiles, 5 green tiles, 3 purple tiles, and 4 blue tiles.

3. What is the probability a yellow tile will be randomly picked from the bag?

022

0)( yellowP

A bag contains 10 red tiles, 5 green tiles, 3 purple tiles, and 4 blue tiles.

4. Calculate the mean.

5. Calculate the range.

4

)43510( tiles62

15

4

22

tiles7310

QuizFriday

Which ball should you add so that the

probability of drawing the color is 1/3 ?

Which ball gives a probability of 1/3?

There were eleven balls. If one more ball is added there will be twelve balls. I need a probability of 1/3. A probability of 4/12 will reduce to 1/3. I added one ball to every color. I needed a color that would have 4 balls.

Which ball should you add so that the probability of drawing the color is 1/3 ?

The blue ball give a probability of 1/3.

11 ballsAdd 1 ball5 green3 blue2 pink1 yellow

413: Blue

3

1

12

4)( blueP