**Answer:**

2 hours

**Step-by-step explanation:**

given that the calorie burn rates are:

swimming: 400 cal / hour

rollerblading: 600 cal / hour

If he swims for 3 hours, he will burn:

400 cal / hour x 3 hours

= 1200 cal

Since his goal is 2400 calories, the number of calories that he has left to burn after swimming is:

2400 - 1200

= 1200 calories.

Number of hours of rollerblading to burn 1200 calories

= 1200 calories ÷ 600 calories per hour

= 2 hours

To find area, you use:

L×W=A

We know the area, so let's plug that in.

L×W=15

We also received more information. Let's say the length is the longer side.

L=W+2

Let's plug that in for L.

W(W+2)=15

W²+2W=15

You can find W by putting it in a graph. You could also solve by guessing and checking.

**So, the shorter side is 3 inches long.**
**Answer:**

a=9in

**Step-by-step explanation:**

Pythagoreans Theorem

a^2+5.6^2=10.6^2

a^2+31.36=112.36

a^2=81

(take square root of both sides)

**a=9**

i'd say it would be 4 over 1 4/1 so you go up 4 and to the right 1 if they were negative then it would be the oposite way around.

You can break it up into two triangles