It’s C, All equilateral triangles have interior angles equal to 60 degrees
<h3>
Answer: an = 6n - 15 (Choice C)</h3>
======================================================
Explanation:
This sequence is arithmetic
The first term is a = -9
The common difference is d = 6 since we're adding 6 to each term to get the next one (eg: -3+6 = 3 or 3+6 = 9 or 9+6 = 15)
Plug those values into the arithmetic nth term formula below
an = a + d*(n-1)
an = -9 + 6*(n-1)
an = -9 + 6n-6
an = 6n - 15
--------------
As a check, let's plug in something like n = 1
an = 6n - 15
a1 = 6*1 - 15
a1 = 6 - 15
a1 = -9
We see that the 1st term is -9, which matches the sequence given
Now let's plug in n = 2
an = 6n - 15
a2 = 6*2 - 15
a2 = 12 - 15
a2 = -3
The 2nd term is -3. This also matches.
I'll let you check the other values of n to confirm the answer.
5 cars are 0-9
15 cars are 10-19
55 cars are 2-29
5 + 15 + 55 = 75 total cars are less than 30 miles per gallon.
In addition to the information given in the question,
the answer is going to depend on ...
-- the dimensions of the dice
-- the height of the box.
