Smart Board Tester

8/14/2019 Smart Board Tester

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1.

2. Represent the number line below in interval notation and set builder notation.

3. If 9 packs of mac'n cheese cost $3.69, how many would 15 cost?

4. What is the ratio of a triangle's area to it's base?

Warm Up

0 2 4-2-4


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MATH 9RAssignment Sheet #2

Assignment #30

p. 201p. 196

49. 9.5 x 1012

50. 1.2 x 1022

51. 5.0 x 10-13

52. 8.0 x 10-4


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TONIGHT'S HOMEWORK: Assignment #31

HOMEWORK DUE: Assignment #30

QUIZ : Thursday

TEST: Next Friday

SECOND QUARTER BEGINS!


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Divide:

Divide: 6s2 + 5s - 6, by 2s + 3


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Rate, Ratio & Proportion Quick Review

1. If the instructions for cooking a turkey state Roastturkey at 325 for 20 minutes per pound, how

many hours will it take to roast a 20-pound turkeyat 325?

2. Sterling silver is made of an alloy of silver andcopper in the ratio of 37:3. If the mass of a

sterling silver ingot is 600 grams, how much silverdoes it contain?(1) 48.65 g (3) 450 g(2) 200 g (4) 555 g

3. A rocket car on the Bonneville Salt Flats is travelingat a rate of 640 miles per hour. How much timewould it take for the car to travel 384 miles at thisrate?(1) 36 minutes (3) 256 minutes(2) 245 minutes (4) 1.7 hours

4. You are making a cookie recipe that calls for 2 cupsof flour and 4 eggs. You have 6.5 cups of flour, andyou want to use it all up. How many eggs will youuse?


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If the side of a square is

given find the perimeter.

Side Perimeter1

2

3

Note: as the side changes, the perimeter alsochanges

This is an example of a DIRECT VARIATION.

Two variables vary directly if their ratio is constant.


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DIRECT VARIATION


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DIRECT VARIATION


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There are 3 forms of a direct variationquestions:

1. Table (similar to x, y chart)a) check to see if each ratio reduces

to the same number.b) constant of variation (cv) is the

same number.c) write a formula

2. Graph

3. Word Problem Questions


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Examples: TABLES


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Find m and n if it is a direct variation


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2. Graph:a) must be a straight lineb) must go through the origin

c) must be a positive slope

Example: state which are direct variations


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3. Word Problem Questionsa) A varies directly as h. A = 48 when h = 4.

Find h when A = 36.

b) If x varies directly as y such that x is 12 and y is 3,find x when y = 4

c) There are about 60 calories in 30 grams of cannedsalmon. About how many calories are there in 210grams of salmon?

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