Answer: 15
Step-by-step explanation:
For this question you have to use pythagoras' theorem.
Pythagoras' theorem is c²=a²+b²
So c is the hypotenuse and the hypotenuse is always opposite the right angle.
So the equation would be c²=9²+12²
Then 9²=81 and 12²=144
So the equation would then be c²=81+144
So c²=225
Then you just want to find c on it's own so you have to square root it which is 15.
Answer:
For the first one, x is 9 and y is 2. 9 + 3(2) = 15. The second is y = 3.75
Answer:
-6%
Step-by-step explanation:
Here's why: The total he could have gotten was 100%. He got a 76%, which is 24% less. If you do 24 divided by 4, the answer will tell us how many points is for each question. The answer is 6. To double check, you can do this, if each question is worth 6 points, and he misses 4 questions, that means that he loses 24% worth of points, 100 minus 24 equals 76%. I did my answer negative, because the question wants to know his change in score for each question he gets incorrect, that means his score is going down which is negative...