Step-by-step explanation:
2x-y=6 --------(1)
x+y=6 -------(2)
_____ Adding (1) and (2)
3x = 12
x=4
Substitute x on equation (2)
4+y=6
y=2
Answer: He must have atleast 98 points on the next exam in order to get an average of 92 points.
Step-by-step explanation: To calculate average, you need to add all the numbers given, and divide the sum by how many numbers there are. 87 + 89 + 94 + 98 (equals 368), and divide 368 by 4. You will get the average of 92 as its result.
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Given:
The shape is square.
To find:
The surface area and volume of a square.
Explanation:
The length of each side of the square is "a" units.
The formula for the surface area of the square is,

The formula for the volume of the square is,

Using these formulas, we can find the surface area and the volume of the square that has side length "a" units.
For example:
Let the side length of 3cm for a square.
So, the dimensions are 3cm by 3cm by 3cm.
That is,
The Length is 3cm.
The breadth is 3cm.
The height is 3cm.
So,

The surface area of the square is,

Therefore, the surface area of the square is 54 square cm.
The volume of the square is,

Therefore, the volume of the square is 27 cubic cm.
Answer:
Answer D
Step-by-step explanation:
1/2 in. = 25 mi.
1 in. = 50 mi.
12x50 = 600
12 represents the total inches on the map to her friends town 50 represents the miles an inch.