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hram777 [196]
2 years ago
8

A student states that the reflection of triangle ABC across the y-axis is triangle A’B’C’. Determine if the student is correct o

r has made an error. <:)

Mathematics
1 answer:
Svet_ta [14]2 years ago
8 0

Answer: The student is <u>not</u> correct

To reflect over the y axis, you use this rule

(x,y) \to (-x,y)

The x coordinate swaps in sign (from positive to negative, or vice versa) while the y coordinate stays the same.

So for a point like A(1,1), it should move to A ' (-1, 1) and not (-2,1) like the diagram shows.

B(3,1) should move to B ' (-3, 1)

C(1,4) should move to C ' (-1, 4)

It appears that the student applied a reflection over the y axis, and then they shifted the triangle 1 unit to the left.

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Answer:

In bold answers with correct units

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4) = 12 x 12 = 144 + 4x4 = 16 +12 x 4 = 48 = 144+12+48 = 204m^2

5) = 8 x 12 = 96 + 1/2 x 4 x 6 = 12 = 108ft^2

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7) 10 x 8 = 80 +4 x 4 = 16 + 1/2 x 2 x 4 = 4 = 20+80= 100ft^2

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8 0
2 years ago
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Classify abc by its angles if m
mojhsa [17]
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3 0
2 years ago
A sweater is on sale for 30% off the ticketed price of $84. How much will the sweater cost after the discount?
Marianna [84]
84 x .70 = $58.80

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3 0
3 years ago
I have 7 hundreds blocks, 5 tens blocks, and 8 ones blocks. I use my blocks to model two 3-digit numbers. What could my two numb
lawyer [7]
There 7 blocks of hundreds which means each such block is equivalent to 100.
There are 5 blocks of tens, which means each such block is equivalent to 10.
There are 8 blocks of ones, which means each such block is equivalent to 1.

The total of these blocks will be = 7(100) + 5(10) + 8(10) = 758

We can make several two 3-digit numbers from these blocks. An example is listed below:

Example:
Using 3 hundred block, 2 tens blocks and 4 ones block to make one number and remaining blocks to make the other number. The remaining blocks will be 4 hundred blocks, 3 tens blocks and 4 ones blocks
The two numbers we will make in this case are:

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2nd number = 4(100) + 3(10) + 4(1) = 434

The sum of these two numbers is  = 324 + 434 = 758
i.e. equal to the original sum of all blocks.

This way changing the number of blocks in each place value, different 3 digit numbers can be generated. 
5 0
2 years ago
If the common difference of an ap is 3/2 and its 20 th term 35×1/2 find first term and 15 th term
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Answer:

Step-by-step explanation:

d = 3/2

a₂₀ = a₁+19d

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a₁₅ = a₁+14d = -11 + 14×3/2 = 10

4 0
2 years ago
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