Tell whether the ratios form a proportion.
1 to 0.4 and 9 to 3.6

no?  cause one is negative and the other is positive and I'm guessing they both have to be the same

Step-by-step explanation:

3  =  x

x         3

These are fractions btw

Cross multiply:

3 * 3 = x * x

Simplifying

3 * 3 = x * x

Multiply 3 * 3

9 = x * x

Multiply x * x

9 = x2

Solving

9 = x2

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-1x2' to each side of the equation.

9 + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0

9 + -1x2 = 0

Add '-9' to each side of the equation.

9 + -9 + -1x2 = 0 + -9

Combine like terms: 9 + -9 = 0

0 + -1x2 = 0 + -9

-1x2 = 0 + -9

Combine like terms: 0 + -9 = -9

-1x2 = -9

Divide each side by '-1'.

x2 = 9

Simplifying

x2 = 9

Take the square root of each side:

x = {-3, 3}

there are 70 more legs than eyes at the dog show (196 – 126 = 70). dogs have two more legs than eyes, and humans have the same number of legs as eyes. thus 70 is twice the number of dogs at the show, so the number of dogs is half of 70, which is 35. to get the number of humans, subtract 35 from 63: 63 – 35 = 28.

step-by-step explanation: