Unit 4 Revision

What is the process of changing the subject of a formula called?

• Rearranging the formula

• Flipping the formula

• Reversing the formula

• Inverting the formula

Solve the quadratic equation by factorising: x^2 + 5x + 6 = 0

• (x + 2)(x + 3) = 0

• (x - 5)(x - 1) = 0

• (x - 2)(x - 3) = 0

• (x + 1)(x + 6) = 0

In a right-angled triangle, if the length of the hypotenuse is 10 and one angle is 30 degrees, what is the length of the opposite side?

• 8

• 3

• 5

• 12

What is the value of the third quartile in a set of data?

• The value of the third quartile in a set of data is the mean

• The value of the third quartile in a set of data is the 25th percentile

• The value of the third quartile in a set of data is the median

• The value of the third quartile in a set of data is the 75th percentile.

Estimate the value of 345.67 + 123.45

• 512.34

• 468.12

• 469.12

• 377.89

What is the formula to change the subject of the equation A = πr^2 to find the radius?

• r = A * π

• r = √(A/π)

• r = A/π

• r = A - π

Solve the quadratic equation by factorising: 2x^2 - 7x - 15 = 0

• (2x + 5)(x - 3) = 0

• (2x - 7)(x + 15) = 0

• (2x - 3)(x + 5) = 0

• (2x + 3)(x - 5) = 0

In a right-angled triangle, if the length of the hypotenuse is 15 and one angle is 45 degrees, what is the length of the adjacent side?

• 10.61

• 5.2

• 12.3

• 7.5

What is the value of the first quartile in a set of data?

• The value of the first quartile is the median of the data.

• The value of the first quartile is the 25th percentile of the data.

• The value of the first quartile is the 75th percentile of the data.

• The value of the first quartile is the 50th percentile of the data.

Estimate the value of 456.78 - 234.56

• 689.34

• 222.22

• 345.67

• 123.45