it is a right angle! the angle formed by perpendicular lines is a 90 degree angle.
The answer is probably 14, but I don't know how to prove it correctly, I mean by using the mathematical language. So if it will work, I can try to guess how I got this answer. So if you will draw radiuses, like I did on the screenshot, you will get 2 equal to each other triangles, but the thing is that I have no idea why they should be equal. So if the first step is right the value of x should be equal to 14, as the side below is equal to 14 too. That's it, I guess I helped you at least a little!
An example scenario is:
Anthony goes to the gym for <em>20</em> minutes on Monday. Every day he <em>multiplies</em> his gym time by <em>2</em>.
On the fifth day, he will spend spend 320 minutes in the gym.
The formula used to determine the 5th term is,
a5 = 20 x 2^(r -1)
where r is the common ratio equal to 2.
Given:
5 red model cars
1/3 of his model cars are red.
This means that 5 is 1/3 of Max's collection. To get the number of his whole collection, we simply divide 5 by 1/3.
5 ÷ 1/3 ⇒ 5 x 3/1 = 15
Max has a total of 15 cars in his collection.