Quiz about Year 9 5.2 Review

Question 1

Increase 80m by 20%

Accepted Answer

96

Answer

16

Answer

64

Answer

80

Question 2

Decrease $100 by 15%

Accepted Answer

$85

Answer

$115

Answer

$15

Answer

$75

Question 3

Expand (3x+4)(2x-3)

Accepted Answer

$$6x^2-x-12$$

Answer

$$5x^2-x-10$$

Answer

$$5x^2-x-7$$

Answer

$$6x^2-9x-7$$

Question 4

Simplify $$6r imes2 imes8x$$

Accepted Answer

96rx

Answer

16rx

Answer

12r+8x

Answer

96x

Question 5

Simplify $$\frac{20xy}{10x}$$

Accepted Answer

2y

Answer

2xy

Answer

20xy

Answer

10xy

Question 6

Find the length of the unknown side

Accepted Answer

20

Answer

5

Answer

18

Answer

22

Question 7

Express 884000 in scientific notation

Accepted Answer

$$8.84\ imes10^5$$

Answer

$$8.84\ imes10^6$$

Answer

$$8.84\ imes10^7$$

Answer

$$8.84\ imes10^3$$

Question 8

How much interest does an $2000 investment earn at a rate of 3% pa for 4 years ?

Accepted Answer

$240

Answer

$40

Answer

$60

Answer

$200

Question 9

A $3000 Investment earns $150 interest after 3 years, What was the interest rate ?

Accepted Answer

1.67%

Answer

0.16%

Answer

16%

Answer

167%

Question 10

A group of students were asked why they skipped breakfast. The two reasons given were that they were "not hungry" and they were "too busy".

How many students skipped breakfast because they were too busy ?

Accepted Answer

24

Answer

11

Answer

13

Answer

19

Question 11

Find the gradient of the following line

Accepted Answer

2

Answer

8

Answer

-8

Answer

-2

Question 12

The x-intercept of the following equation $$2x+4y=10$$ (hint: make y=0)

Accepted Answer

x=5

Answer

x=3

Answer

x=20

Answer

x=6

Question 13

Calculate the tax payable on an income of $39 000

Accepted Answer

$4222

Answer

$4321

Answer

$4472

Answer

$Nil

Question 14

Simplify $$\frac{5u}{6a} imes\frac{3v}{20b}$$

Accepted Answer

$$\frac{uv}{8ab}$$

Answer

$$\frac{uv}{ab}$$

Answer

$$\frac{15uv}{20ab}$$

Answer

$$\frac{8ab}{uv}$$

Question 15

Simplify $$\frac{4\left(x+2\right)}{2\left(x+2\right)}$$

Accepted Answer

2

Answer

2(x+2)

Answer

2x

Answer

4(x+2)

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