Year 9 Semester 1 Review

Finanical Maths

100

What is 25% of 120?

30

200

Mr Rice bought a bike for  $15,000, He spent $ 2050 to fit it with niro tires and sold it for  $ 19,000. Find his profit or loss ?

Profit of $1,950

300

Lorraine purchased a Beats wireless headphone for $199.09. How much GST should be paid on this item?

$19.909 or $19.91

400

Kindle loaned Marissa $20,000 to buy a car at a simple interest rate of 3.1% for 5 years. How much interest does Marissa give Kindle?

$3,100

500

Amy deposited $8,500 in a savings account that paid 2% compounded quarterly. What was the balance after the first quarter (first 3 months)?

$8542.50 

8500 x .02 = 170/4=42.50 

8500 + 42.50 = 8542.50

Statistics

100

What is the Mode for this set of data?

3, 4, 7, 8, 9, 11, 23, 4, 7, 5

Bimodal: 4 and 7

200

Calculate the median of the following data:

2, 3, 7, 5, 8

Median = 5

300

What type of graph is it when the majority of the data in a graph is towards the left-hand side 

It is positively skewed 

400

What is it called when there is a difference between the upper and lower quartiles that represents the middle 50% of the study

The inter-quartile range

500

Find the lower quartile median for the data:

106, 107, 107, 108, 109, 114, 115, 117, 117, 124

Q1=107

Linear Relations

100

What do you label the gradient of a linear graph if the line is horizontal?

Zero

200

Calculate the gradient: (5, 7) and (3, 6) 

1/2

300

Write the linear equation with the following info:

m=3

c =-1

y= 3x - 1

400

Solve: 3x + 2 = 5

x = 1

500

Find the midpoint of (1, -4) and (-4, 2)  

(-1.5, -1)

Pythag & Trig

100

When using Pythagoras Theorem, what is the formula to calculate side c?

c²=a²+b²

200

What is the longest side length of a triangle called?

Hypotenuse

300

Calculate the Hypotenuse is the other side lengths are 10cm and 24cm.

26cm

400

What is does CAH stand for in trigonometry?

Cosine = Adjacent divide by Hypotenuse

500

Find: cos(59) (to 2 decimal places)

0.52

Try Your Luck

100

2 x 13

26

200

How many days in 4 weeks?

28

300

How long is the opposite side of a right angled triangle if the reference angle is 50 degrees and the hypotenuse is 14cm? (2d.p)

10.72cm

400

How many minutes of Maths do you have in a week?

220 minutes

500

Find the distance between

(4, 8) and (9, 15)

√74=8.60