SECTION 4.5 REVIEWGrade 7 – Chapter 4

QUESTION #5

Sainan is designing fences for a summer job. One kind of rail fence has three rails and one post per section

Use a scatter plot to determine the number of posts and rails he will need for a fence that is 12 sections. Explain what you did.

1 Section

A) 12 Sections LongSection Number Posts Rails Posts and Rails

1 2 3 5

2 3 6 9

3 4 9 13

4 5 12 17

5 6 15 21

0 2 4 6 8 10 12 14 160

10

20

30

40

50

60

Number of Sections

Nu

mb

er

of

Post

s an

d R

ail

s

QUESTION #8

Nitharsana is building a rail fence that has sections like this.

Use a scatter plot to determine the number of posts and rails Nitharsana will need to build each fence.

1 Section

A) 8 Sections long B) 14 Sections long Section Number Posts Rails Posts and Rails

1 2 4 6

2 3 8 11

3 4 12 16

4 5 16 21

5 6 20 26

0 2 4 6 8 10 12 14 160

10

20

30

40

50

60

70

80

Number of Sections

Nu

mb

er

of

Post

s an

d R

ail

s

MATH CONGRESS

QUESTION ONE QUESTION TWO

Usha reads 10 pages of a novel on night 1. Each night after that she reads three pages more than the night before. Usha thinks she can finish reading her 219 page novel in 10 days. Thivya thinks it’ll take her 22 days.

The student council held a car wash to raise $200 for the Children’s Hospital. In the first hour they washed three cars. Each hour after that the number of cars they washed increased by two. How many cars did they wash at the end of 6 hours? If they charged $5.00 per car did they reach their goal?

What strategy will you use, Table of Values or a Scatter Plot to solve the problem? Why did you choose that strategy.