Answer:
b) 91
Step-by-step explanation:
<u>Step 1: Multiple marks by its weights</u>
<em>Homework average:</em> 95 x 20% = 19
<em>Quiz average: </em>90 x 20% = 18
<em>Test average:</em> 87 x 40% = 34.8
<em>Final exam:</em> y x 20% = 0.2y
<u>Step 2: Add all weighted averages and find y</u>
19+18+34.8+0.2y = 90
71.8 + 0.2y = 90
y = 18.2/0.2
y = 91
Therefore, Anna needs to score minimum 91 in the final exam so that she can score a 90 in class.
Option b is correct.
!!
Answer:
Step-by-step explanation:
8/24 are Red
Pick and return 2
So it will be 7/25
Again pick and return 2
Then it is 6/26
Now multiply the results
8/24 × 7/25 × 6/26 = 7/ 325
10x+13
Step-by-step explanation:
Step 1:
1)
The perimeter of any given triangle is the sum of all its sides.
For example if we have a triangle with sides x,y,z then the perimeter of this triangle can be obtained by taking the sum of the sides. So in this case , the perimeter would be x+ y+ z
Step 2:
Given that the sides of the triangle are 2x+5 , x+8 , 7x
To find the perimeter of this triangle we need to sum the given sides.
This would be
2x+5+x+8+7x = 10x + 13
So the perimeter of the given triangle is 10 x + 13
ANSWER
EXPLANATION
The volume of a pyramid is given by the formula,
The base of the pyramid is an equilateral triangle.
The base area is
The volume of the pyramid is now equal to: