What is 2 and 3/4 times 4/5. Please help me

2 answers:

5 0

First change 2 3/4 into an improper fraction. 11/4
Then find the lcd for 11/4 and 4/5.
Its 20.
So 55/20 - 16/20 = 39/20
Then change 39/20 to a mixed number. So 1 19/20 .
Youre answer is 1 19/20
Hope this helped!

skelet666 [1.2K]3 years ago

4 0

The answer should be 2.2, or as a fraction from 2 and 1/5
as 2 and 3/4 can be changed to 2.75 and 4/5 can be changed to 0.8

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A drawing of the triangle is attached.

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$d=\sqrt{(y_2-y_1)^2+(x_2-x_1)^2}=\sqrt{(34-1)^2+(0-4)^2}
\\
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To find the length of the base:
$d=\sqrt{(0-1)^2+(0-4)^2}=\sqrt{(-1)^2+(-4)^2}=\sqrt{1+16}=\sqrt{17}
\\
\\\approx4.12$

The area of a triangle is given by A=1/2bh:
A=1/2(33.24)(4.12) = 68.4744 ≈ 68.47