paper 2h

Question 1

How would you do 0.049 x 0.007?

Answer 1

0. 049 49
   
   • ——- (x1000) —– = 7
     0. 007 7

Question 2

How do you find HCF and LCM?

Answer 2

HCF = multiply everything in the centre 
LCM = multiply everything

Question 3

y to the power of 1/2 = ?

Answer 3

square root of y

Question 4

What does sin = ?

Answer 4

opposite / hypotenuse

Question 5

Try this SOH q & the TOA question underneath

Answer 5

http://www.bbc.co.uk/schools/gcsebitesize/maths/geometry/trigonometryrev2.shtml

Question 6

Try this CAH question

Answer 6

http://www.bbc.co.uk/schools/gcsebitesize/maths/geometry/trigonometryrev3.shtml

Question 7

when you are working out the length of the hypotenuse of a right angle triangle what do you use?

Answer 7

CAH / cos = adjacent side length over hypotenuse

Question 8

what’s the difference between cos and tan?

Answer 8

with cos you have the adjacent side length and are trying to find the hypotenuse whereas with tan you are trying to find the opposite sides length using the adjacent side

Question 9

if you are finding angle C on a right angle triangle what do you often have to do when using sin, cos or tan?

Answer 9

inverse them aka press shift on your calculator then sin, cos or tan

Question 10

Simplify Equation: 4/square root 3

Answer 10

4 square root 3 / 3

Question 11

what is the quadratic equation

Answer 11

y= ax squared + bx + c

Question 12

what is the quadratic formula

Answer 12

                             2a

Question 13

if a point on a parabola in a graph has the coordinates (2,12) and the general equation for that graph is y=kx squared what is k?

Answer 13

12=k2 squared
12=4k
12/4=k
3=k

Question 14

£8000 is put in a bank for 16 years with a compound interest of 8% each year; how do you find out how much is in the back at the end of the 16 years?

Answer 14

8000x1.08^19

Question 15

how do you figure out the area of a trapezium

Answer 15

width of top + width of bottom
——————————————- x height
2

Question 16

a sequence is defined by the term to term rule Un+1 = Un^2 - 5Un +2; given that U1 = 4 figure out U2 U3 and U4

Answer 16

U2= -2
U3= 16
U4= 178

Question 17

When estimating mean what do you do?

Answer 17

(x = mid point) (f= frequency)
total fx
———
total f

Question 18

Bag A contains three red marbles and four blue marbles.
Bag B contains five red marbles and three blue marbles.
A marble is taken from each bag in turn.
how would you figure out what the probability of getting a blue marble from a bag a and then a red marble from bag b is?

Answer 18

you would use a probability tree diagram that looks like this
RED RED: 5/8
3/7

Question 19

How do you measure the radius of a circle?

Answer 19

from the side to the middle

Question 20

How do you figure out the area of a circle?

Answer 20

PiR^2

Question 21

What formula do you use for population growth

Answer 21

__x_.__^?

AKA the compound interest formula

Question 22

When solving simultaneous equations with quadratics which one do you subsitute?

Answer 22

You substitute the linear into the quadratic

Question 23

When factorising a quadratic what do you do?

Answer 23

quadratic looks like aX^2 + bX + (or -) c you times a and c then find two numbers that add to make b and multiply to make ac
then you split bX into those two numbers and factorise from there

Question 24

How do you find the volume of a cone?

Answer 24

find the area of the base circle. …
Find the height of the cone. …
Multiply the area of the base by the height of the cone. …
Divide the product by three.

Question 25

What is inverse proportion?

Answer 25

as one thing increase the other decreases

Question 26

if y is inversely proportional to x then y=?

Answer 26

y= 1/x

Question 27

if you have a fibonacci sequence question where they are looking for a value for n where Xn + Xn+1 = 21 what’re they looking for in simple terms?

Answer 27

A place (1st number, 2nd, 3rd, 4th etc..) for n where that __th term in the sequence plus the next term = 21