**Answer:**

2.6 and 5.4 are both the same sign, he should add them and then take that negative sign from (-5.4), so the answer would be -8.0.

**Answer:**

HL (Hypotenuse Leg)

**Step-by-step explanation:**

You have BC=CD (Because of reflexive property), AC=DC, and measure of BAC is equal to the measure of BDC, which is 90 degrees. Since these triangles are right and they have a hypotenuse and a leg congruent, you can say that they are congruent because of HL.

**Answer:15 percent**

**Step-by-step explanation:**

(.75) / 5 = 3/20 = 15/100 = 15%