Question 1
Work out.
Give your answer as a fraction in its simplest form.
[3]
Work out.
Give your answer as a fraction in its simplest form.
[3]
The diagram shows two straight lines crossing a pair of parallel lines.
Write down the value of a. Give a reason for your answer.
[2]
The diagram shows a prism of length 10 cm.
The cross-section of the prism is a right-angled triangle. The base, b cm, is 2 cm longer than the height, h cm. The volume of the prism is 240 cm3.
A student is explaining how they worked out the value of b.
They say
b is 6 because that means h is 4 and 6 × 4 × 10 = 240.
Describe the student’s error and find the correct value of b.
[3]
The table shows the ages and heights of 12 children.
| Age (years) | 2 | 4 | 12 | 6 | 10 | 11 | 13 | 11 | 5 | 7 | 9 | 14 |
| Height (m) | 0.84 | 1.01 | 1.5 | 1.4 | 1.4 | 1.35 | 1.62 | 1.42 | 1.14 | 1.24 | 1.26 | 1.68 |
The points for the first eight children (shaded in the table above) are plotted on the scatter diagram.
Plot the points for the remaining four children.
[2]
Describe the type of correlation shown in the completed scatter diagram.
[1]
One of these children is taller than expected for their age.
On the scatter diagram, circle the point representing this child.
[1]
Kai is 8 years old. By drawing a line of best fit, estimate Kai’s height.
[2]
Describe an assumption you have made in giving your answer to part (d)(i).
[1]
Explain why using this data to estimate the height of a child that is 17 years old may be unreliable.
[1]
Taylor has a full bottle of medicine. The bottle holds 20 doses of medicine.
Each day Taylor takes one dose of medicine out of the bottle. After 8 days, there are 180 millilitres of medicine left in the bottle.
Work out how many millilitres of medicine the bottle holds when full.
[4]
A volunteer packs boxes for a charity. They can pack 5 boxes in 45 seconds.
Use this information to show that they can pack 55 boxes in less than 9 minutes.
[4]
What assumption did you make in part (a) ?
[1]
A block made of iron is in the shape of a cuboid. The block is 3.1 cm by 4.9 cm by 2.2 cm. The density of iron is 7.87 g / cm3. Sam thinks that the mass of the block is about 2.4 kg.
Use estimation to decide if Sam’s answer is reasonable. Show how you decide.
Sam’s answer is........ because........
[5]
A zoo counts its animals. The ratio of antelope to zebra is 3: 2. The ratio of meerkats to zebra is 7: 3.
Write the number of antelope as a percentage of the number of zebra.
[2]
There are 15 more meerkats than antelope.
Work out the number of zebra in the zoo.
[4]
A student draws two different regular polygons. The exterior angle of one polygon is p °. The exterior angle of the other polygon is q °.
The sum of p and q is 112°. The difference between p and q is 32°.
Find the number of sides of each polygon. You must show your working.
........ sides and........ sides
[6]
y is directly proportional to the square of x.
Find the percentage decrease in y when x is decreased by 30%.
[4]
Here are the first four terms of a sequence.
2 5 8 11 5 10 17 26
The diagram shows a triangle, ABC, with perpendicular height BD.
BC = 12 cm, angle BCD = 30° and angle BAD = 45°.
Work out the exact length of AB. Give your answer in its simplest form.
[3]
The graphs of x = - 3 and y = - x are drawn on the grid.
The region R satisfies the following inequalities.
By drawing one more line, find and label the region R.
[5]
Solve by factorisation.
3x2 - 2x - 8 = 0
[3]
where is a fraction in its lowest terms. Find the value of p and the value of q.
[4]
A rhombus is drawn on a coordinate grid. One diagonal of the rhombus has equation y = + 3. The other diagonal passes through the point (1, 7).
Find the equation of the other diagonal of the rhombus. Give your answer in the form y = mx + c.
[4]
A box contains 25 discs. The discs are either blue or yellow in the ratio 4: 1. Two discs are chosen at random from the box without replacement.
Find the probability that the two discs are different colours. You must show your working.
[5]
OABC is a parallelogram.
Find the following vectors in terms of a and c. Give your answers in their simplest form.
Line CN is extended to reach point P, such that =
Show, using vectors, that OAP is a straight line.
[4]
The paper as printed
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