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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