Answer:
15 marks
Step-by-step explanation:
If the average mark obtained by 3 students is 15, then the total marks are
⇒ 3 x 15 = 45
Let x be the marks obtained by the third student.
If two students obtained 12 and 18 marks, then
⇒ 12 + 18 + x = 45
⇒ 30 + x = 45
⇒ x = 45 - 30
⇒ x = 15
Answer:
B
Step-by-step explanation:
![[(8+15) \times 3] \div 3\\= \frac{(8+15) \times 3}{3}\\= \frac{8 + 15}{1}\\= 8 + 15 = 23](https://tex.z-dn.net/?f=%5B%288%2B15%29%20%5Ctimes%203%5D%20%5Cdiv%203%5C%5C%3D%20%5Cfrac%7B%288%2B15%29%20%5Ctimes%203%7D%7B3%7D%5C%5C%3D%20%5Cfrac%7B8%20%2B%2015%7D%7B1%7D%5C%5C%3D%208%20%2B%2015%20%3D%2023)
Answer:
A rectangle has a length 6m less than twice its width. when 5 m are added to the width, the resulting figure is a square with an area of 256m^2. find the distance of the original rectangle
width:: x
length:: 2x-6
-------
New width:: x+5
---
Equation:
(x+5)^2 =256 =16
16 is the original length
Answer:
B - perpendicular
Step-by-step explanation:
AE is parallel to CH, and since AC is perpendicular to AE, CH and AC are perpendicular
hope this helps youu
Answer:
o;ihio;o;i;
Step-by-step explanation: