The diagram shows a tree and a man. The man is of average height. The tree and the man are drawn to the same scale.

a) Write down an estimate for the real height, in metres, of the man. [1 MARK]
b) Find an estimate for the real height, in metres, of the tree. [2 MARKS]

Step-by-step explanation:

search on the internet : average height of a man : 175.4 centimeters. or 1.754 meters.

then, by imagining the man standing on top of himself (and again and again), I see that the tree is about 4 times the height of the man.

so, the estimate for the height of the tree is

4×1.754 = 7.016 meters ≈ 7 meters.

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

898.1666667

step-by-step explanation:

5389/6 = 898.1666667