Answer:
B). 5.6
Step-by-step explanation:
3.2/x = 4/7
Then, cross-multiply
4x = (3.2) 7
4x = 22.4
x = 5.6
Answer:
D ; Yes because the Pythagorean theorem works
Step-by-step explanation:
The measure of all three sidelengths make a right triangle
Answer:

Step-by-step explanation:

Isolate d

.
Divide both sides of the equation by b

Simplify

Can you give more information
Answer:
line 2
Step-by-step explanation:
on line 2 the two minuses at the end turn into a + (where the -2 is there should be a +2) because - x - = +