Let

be the radius of the cone's base and

the slant height.
The surface area of a cone is

If the radius is quadrupled (

) and the slant height scaled by a factor of

, then the new area is

Answer:
Step-by-step explanation:
-3x^2 - 10x - x^2 - 6x
-4x^2 - 16x
200 million drivers in the untied states
Answer:
37.70% probability that the student will pass the test
Step-by-step explanation:
For each question, there are only two possible outcomes. Either the student guesses it correctly, or he does not. The probability of a student guessing a question correctly is independent of other questions. So we use the binomial probability distribution to solve this question.
Binomial probability distribution
The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

In which
is the number of different combinations of x objects from a set of n elements, given by the following formula.

And p is the probability of X happening.
10 true/false questions.
10 questions, so 
True/false questions, 2 options, one of which is correct. So 
If a student guesses on each question, what is the probability that the student will pass the test?








37.70% probability that the student will pass the test