Question

-3,5:4=x:20; -1,9:3=x:15; 4,1:-7=20,5:x;

Answer 1

-0.875=x:20

x=-0.875*20

x=-1705

0.633=x:15

x=0.633*15

x=9.495

-0.5857142857=20.5:x

x=-0.5857142857*20.5

x=-12.007142856

Answer 2

To solve each proportion, we can use the cross-multiplication method. The general form of a proportion is a/b = c/d. To find the value of x, we can cross-multiply and solve for x.

1. -3/5 = x/4

Cross-multiplying: -3 * 4 = 5 * x -12 = 5x

Now, divide both sides by 5 to solve for x: x = -12/5 x = -2.4

2. -1/9 = x/3

Cross-multiplying: -1 * 3 = 9 * x -3 = 9x

Now, divide both sides by 9 to solve for x: x = -3/9 x = -1/3

3. 4/1 = 20.5/x

Cross-multiplying: 4 * x = 20.5 * 1 4x = 20.5

Now, divide both sides by 4 to solve for x: x = 20.5/4 x = 5.125

So, the values of x for each proportion are:

1. x = -2.4
2. x = -1/3 (or approximately -0.3333)
3. x = 5.125