Answer:
Option 4
Step-by-step explanation:
=> The length of DE = EF will prove that DEF is an isosceles triangle (having two sides equal)
=> Their slopes being the opposite reciprocals will prove that they are perpendicular to eachother and DEF is a right angled triangle.
Answer:
1
Step-by-step explanation:
When a variable does not have a visible coeffecient then the coefficient is 1. (Double check to make sure I'm correct)
Answer:
2210.6 
Step-by-step explanation:
Volume of a cylinder is 
they want to the nearest tenth, so ≈ 2210.6
The answer is A
since 2x+3(2x)=16
Hence 8x=16
Answer:
120000000000000000
Step-by-step explanation:
1.2*10^17
