Answer:
90
Step-by-step explanation:
Find total marks needed for a 90.
90 x 4 = 360 marks
Then, add up the marks on the three tests.
83+91+86 = 260 marks
Finally, subtract from the 360 marks needed.
360 - 260 = 100
Thus, the student needs to score 100 marks in order to get a 90.
<h3>
Answer: <em>
17</em></h3>
Step-by-step explanation:
<em>Pythagorean Theorem</em>
<em>a^2+b^2=c^2</em>
<em>8^2+15^2=c^2</em>
<em>64+225=c^2</em>
<em>289=c^2</em>
<em>Now square both sides</em>
<em>x=17</em>
Answer:

Step-by-step explanation:
1,000 times larger! You're welcome :) All you do it divide the two. Hope this helped!