Question

Does anyone know these maths questions???

Answer 1

I'll do problem 12 to get you started

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Part (a)

The ratio 3:6:7 means the three sides are 3x, 6x and 7x centimeters long. The x is some positive real number.

The longest side is 7x, which is also 16.1, so 7x = 16.1

Divide both sides by 7 to isolate x

7x = 16.1

7x/7 = 16.1/7

x = 2.3

Now we can calculate the other two sides

3x = 3*2.3 = 6.9

6x = 6*2.3 = 13.8

The other two sides are 6.9 cm and 13.8 cm

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Part (b)

Add up the three sides to get

6.9 + 13.8 + 16.1 = 36.8

The perimeter is 36.8 cm.