Does anyone know these maths questions???

I'll do problem 12 to get you started

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

Part (b)

Add up the three sides to get

6.9 + 13.8 + 16.1 = 36.8

step-by-step explanation:

when the line is solid:

when the line is dashed:

this > inequality sign means:

this < inequality sign means:

this > inequality sign means:

this < inequality sign means:

about the problem:

srry i'm not done ! i'll