Answer:
Option A. 
Step-by-step explanation:
we know that
The lateral area of a cone is equal to

we have


substitute and solve for l (slant height)

simplify


Answer:
D, B, C, A
Step-by-step explanation:
Solve the equations by combining like terms, isolating the variable, and dividing the equation by the coefficient of the variable.
Doing this, the first equation should be 2, the second equation should be -2, the third equation should be -1, and the last equation should be -6.
Then, we can order them.
Answer: 23x
Step-by-step explanation:
6b+4=2 has one variable
4+6=10 has no variable
Answer:
7pi/9
Step-by-step explanation:
140 degrees * (pi/180 degrees) = 7pi/9