yr 9 math

Question 1

what is the coefficient of 2x

Answer 1

2

Question 2

what method do we use to make algebra easier

Answer 2

build Up and Solve

Question 3

remember with word questions you must -

Answer 3

Read the question

Question 4

word problems need -

Answer 4

therefore

Question 5

step 1 -

Answer 5

read the question

Question 6

step 2 -

Answer 6

re-read and highlight key details

Question 7

step 3 -

Answer 7

identify the unknown

Question 8

step 4 -

Answer 8

make a formula with the unknown

Question 9

step 5 -

Answer 9

solve with BU and S

Question 10

step 6 -

Answer 10

right brief answer (therefore)

Question 11

step 7 -

Answer 11

can check with substitution

Question 12

what is the opposite of squared?

Answer 12

square root

Question 13

what is the formula for surds?

Answer 13

√ab = √a x √b

Question 14

when can surds be added or subtracted?

Answer 14

if they are ‘like terms’

Question 15

divisible by 2 when -

Answer 15

last digit is even

Question 16

divisible by 5 when -

Answer 16

last digit is 0 or 5

Question 17

divisible by 10 when -

Answer 17

last digit is 0

Question 18

divisible by 3 when -

Answer 18

if the sum of its digits is divisible by 3

Question 19

divisible by 4 when -

Answer 19

if its last 2 digits are divisible by 4

Question 20

divisible by 9 when -

Answer 20

if the sum of it’s digits are divisible by 9

Question 21

what is the hypotenuse?

Answer 21

the longest side opposite the 90 degrees

Question 22

what is Pythagoras theorem formula?

Answer 22

a2 + b2 = c2

Question 23

what is a Pythagorean triple or triad?

Answer 23

a set of three numbers that satisfy the Pythagoras theorem

Question 24

Triad examples -

Answer 24

3,4,5 5,12,13

Question 25

trigonometry note -

Answer 25

Some Old Hags Cant Always Hide Their Old Age

Question 26

formular for sin

Answer 26

sin 0 = opp/hyp

Question 27

formular for cos

Answer 27

cos 0 = adj/hyp

Question 28

formular for tan

Answer 28

tan 0 = opp/adj

Question 29

what happen when you divide sin, cos and tan

Answer 29

sin-1, cos-1, tan-1

Question 30

when do we divide sin, cos and tan?

Answer 30

when we are finding the angle

Question 31

what is the subtopic of trigonometry?

Answer 31

angles of elevation and depression

Question 32

what is perimeter?

Answer 32

the distance an ant would walk around a 2D shape

Question 33

what do you do to figure out a quarter or a half of a circle with perimeter or area?

Answer 33

find out the perimeter or area and divide by 1/4 or 1/2

Question 34

what is surface area?

Answer 34

its the total area of all of a 3D shapes faces

Question 35

TSA -

Answer 35

total surface area

Question 36

CSA -

Answer 36

curved surface area

Question 37

SA -

Answer 37

surface area

Question 38

what is volume?

Answer 38

the amount of space a 3D shape occupies (in cubic units)

Question 39

what is capacity?

Answer 39

the amount a 3D shape can hold (in cubic units)

Question 40

A -

Answer 40

area

Question 41

H -

Answer 41

height

Question 42

what do you do when working backward?

Answer 42

rearrange the formula