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9 Maths S2
Exam Revision
| Question | Answer |
|---|---|
| The general equation for a straight line is ? | y=mx + c |
| In y=mx + c, the gradient is ? | m |
| In y=mx + c, the y-intercept is ? | c |
| The y-intercept is the place where the line cuts which axis? | the y axis |
| The x-intercept is the spot where the line cuts which axis? | the x axis |
| The co-ordinates are written as ? | (x, y) |
| To calculate gradient from a graph, we can use | gradient = rise ÷ run |
| To calculate gradient from 2 points, we use the formula | m= (y2-y1)÷(x2-x1) |
| Does the x-axis go left to right or up and down? | left and right |
| Does the y-axis go left to right or up and down? | up and down |
| To calculate the side of a right angled triangle, given 2 sides we use... | Pythagoras' theorem |
| To calculate the length of the hypotenuse, we use the rule | c squared = a squared plus b squared, c = square root of answer |
| To calculate the length of the shorter side, we use the rule | a squared = c squared minus b squared, a = square root of answer |
| In a right angled triangle, c is known as the | hypotenuse |
| SOA means | sin(angle) = length of the opposite side ÷ length of the hypotenuse |
| CAH means | cos(angle) = length of the adjacent side ÷ length of the hypotenuse |
| TOA means | tan (angle) = length of the opposite side ÷ length of the adjacent side |
| If sin(angle) = 0.5, the angle is | sin-1(0.5) = 30 degrees |
| In a census, we interview | everyone involved |
| In a survey, we interview | a sample of the population |
| Types of data: is your name nominal or categorical | categorical |
| Type of data: height is a nominal data - but is it discrete or continuous | continuous |
| How many suits in a pack of cards | four |
| How many diamonds in a pack of cards | 13 |
| How many cards altogether in a pack of cards | 52 |
| The first 5 prime numbers are: | 2, 3, 5, 7 ,11 |
| Rate of change is another word for | gradient |
| The rule for speed is | distance ÷ time |
| How many seconds in a day? | 60*60*24=86400 |
| If y is directly proportional to x, we can say that y= ? | y=k*x where k is the constant of proportionality (same as the gradient) |
| How do we calculate mean? | Add up the scores. Divide by how many scores there were. (Same as the average) |
| What is the mode? | The most common value. A data set can have more than 1 mode. |
| What is the median? | The middle value. |
| What is the range? | The largest value minus the smallest value. |
Created by:
srolfe
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