Which number line correctly shows 1.5 + 2.5?
1 answer:
Answer:
We conclude that the first line number represents 1.5 + 2.5.
Step-by-step explanation:
Given the expression
It means the first segment must represent 1.5 units starting from 0.
Since we have to add 2.5 to 1.5, so the next segment must represent 2.5 units, starting from 1.5
Combining them would make
Now, if we observe the first number line,
- The first arrow represents the 1.5 units starting from 0.
- The second arrow represents the 2.5 units starting from 1.5.
- The combined units of both arrows represent the length of 4 units. i.e. 1.5 + 2.5 = 4
Thus, we conclude that the first line number represents 1.5 + 2.5.
The correct line number is also attached below.
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Answer:
Step-by-step explanation:
Area of outer triangle =
= 2x*4x + 2x*3
= 8x² + 6x
Area of inner triangle=
Area of aluminium = area of outer triangle - area of inner triangle
= 8x² + 6x + 2x² + 5x
= 10x² + 11x
Area of 20 aluminum borders = 20*(10x² + 11x) = 200x² + 220x
b) x = 25 cm
Area of 20 aluminum borders = 200*25² + 220*25
= 200 * 625 + 220*25
= 125000 + 5500
= 130500 cm²
c) Area of inner triangle (Glass) = 5500 cm²
Cost of aluminium = 130500 * 0.06 = $ 7830
Cost of glass = 5500 * 0.03 = $ 165
Cost of making 20 windows = 7830 + 165 = $ 7995