Answer:
12
Step-by-step explanation:
substitute
4(4-1)
4(3)
12
C is the hypotenuse, so the pythagorean theorem used would be: 15²=13²+6². 225=169+36, but 169+36 does not equal to 225, therefore the triangle is not a right triangle
Answer:
x = 7
Step-by-step explanation:
Step 1. Combine like terms for simplification
x + 2 = 2x - 5
Step 2. Subtact 2 from both sides
x = 2x - 7
Step 3. Subtract 2x from both sides
-x = -7
Step 4. Divide it all by -1 to isolate the variable.
x = 7
