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scoundrel [369]
3 years ago
6

Which shows 42^2 − 38^2 being evaluated using the difference of perfect squares method?

Mathematics
2 answers:
Viktor [21]3 years ago
4 0

Answer:The correct answer is D

Step-by-step explanation:

Basile [38]3 years ago
3 0

Answer:

D

Step-by-step explanation:

a²  - b² ← is a difference of squares and is factored in general as

(a + b)(a - b)

42² - 38² ← is a difference of squares and factors as

42² - 38² = (42 + 38)(42 - 38) = 80(4) = 320 → D

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An item cost $4 before tax and $4.32 after sales tax. What is the sales tax rate?
erma4kov [3.2K]

The sales tax rate of an item that costs $4 is 8%

<h2>Explanation:</h2>
  • An item costs $4 before tax
  • The same item costs $4.32 after sales tax.

So the tax rate can be calculated as:

Tax rate = $4.32 - $4 = $0.32

Next, you must divide the tax rate by the original price in order to get the sales tax rate:

Sales tax rate = $0.32/4$ = 0.08

In percentage:

Sales tax rate % = 0.08x100% = 8%

<h2>Lear more:</h2>

Sales tax rate: brainly.com/question/840427

#LearnWithBrainly

3 0
4 years ago
How do you find 3w-6w+3w×7×7×6×5÷9+2
Viktor [21]
Let's remember orders of operations as we go through the craze of this problem.
We need to multiply or divide from left to right.
3w-6w+3w×7×7×6×5÷9+2
3w-6w+21w×7×6×5÷9+2
3w-6w+147w×6×5÷9+2
3w-6w+882w×5÷9+2
3w-6w+4,410w÷9+2
3w-6w+490w+2
-3w+490w+2
487w+2
To check that we simplified the expression right, I like to put in 1 for w and test it in the original expression and then the simplified expression (not needed).
487+2=489
3-6+3×7×7×6×5÷9+2=489
So that expression equals 487w+2.
3 0
4 years ago
Find the slope and the y-intercept of the line.
baherus [9]
What i got was y=-3x-1
4 0
3 years ago
758x93= What is the answer and how to solve it
Ierofanga [76]

The answer is 70494.

5 0
3 years ago
Will give Brainliest! if right!
liubo4ka [24]
The answer is random sample
4 0
4 years ago
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