Use the following sequence. 3, 6, 12, 24, 48.
1) Mr. Brust says that the 10th term of the above sequence is 768. Is he right? How do you know?

No, Mr. Brust is not right. The 10th term in the sequence is 1536. I know this because each number is double the previous. So, if I work out the sequence up to the 10th term, I get 1536

Step-by-step explanation:

Term Number in sequence/What it is

1 / 3

2 / 6

3 / 12

4 / 24

5 / 48

6 / 96

7 / 192

8 / 384

9 / 768

10 / 1536

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

13.33%

say 50 oranges, then 100 apples

80 are red, 20 are yellow

total fruit = 150

20chances out of 150 for yellow

20/150 = 13.33%