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Alex787 [66]
3 years ago
6

The endpoints of EF are E(1,3) and F(-2,8). Find EF.

Mathematics
1 answer:
Phantasy [73]3 years ago
8 0

Answer:

EF = \sqrt{34} ≈ 5.83

Step-by-step explanation:

Calculate EF using the distance formula

d = \sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2    }

with (x₁, y₁ ) = E(1, 3) and (x₂, y₂ ) = F(- 2, 8)

EF = \sqrt{(-2-1)^2+(8-3)^2}

    = \sqrt{(-3)^2+5^2}

    = \sqrt{9+25}

    = \sqrt{34} ≈ 5.83 ( to 2 dec. places )

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Question 9 - (3 marks available)
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First, round each number to one significant digit (the first digit).

Then multiply them.

a) 17   --> rounds to 20

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