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3 years ago

Please help and actually answer the question (no websites, trolls, etc please.) Thnak you

Mathematics

1 answer:

alina1380 [7]3 years ago

4 0

Answer:

Step-by-step explanation:

Convert 30% to a decimal:

30% = 0.30

Check each item by multiplying the original price by 0.30 (the 30% off sale). Subtract the product from the original price. If the sale price is the same, the pricing is correct. If they are different, the pricing is incorrect.

Headphones:

24.50 × 0.30

7.35

24.50 - 7.35

17.15

17.15 = 7.35? Incorrect.

Phone Charger:

29.25 × 0.30

8.775

29.25 - 8.775

20.475

Round to the nearest cent (hundredths place):

20.48

20.48 = 20.48? Correct.

Minitablet:

117.95 × 0.30

35.385

117.95 - 35.385

82.565

Round to the nearest cent:

82.57

82.57 = 82.57? Correct.

Printer:

213.45 × 0.30

64.035

213.45 - 64.035

149.415

Round to the nearest cent:

149.416

149.416 = 207.47? Incorrect.

Flat Screen TV:

376.98 × 0.30

113.094

376.98 - 113.094

263.886

Round to the nearest cent:

263.89

263.89 = 236.89? Incorrect.

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3 years ago

Use the distance formula to find the perimeter of the triangle below. Round you answer to the nearest hundredth.

Murrr4er [49]

jAlright, let's take this problem step-by-step:

What is the perimeter:

⇒ all the side-lengths added up

⇒ need to find side-length using distance formula

$Distance_._. Formula=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

- (x₁,y₁): first point

- (x₂,y₂): second point

Let's solve:

Find length of AC

⇒ first point: (5,7)

⇒ second point: (3,3)

$Distance =\sqrt{(3-5)^2+(3-7)^2} =\sqrt{4+16} =\sqrt{20} =4.472$

Find length of AB

⇒ first point: (5,7)

⇒ second point:(8,6)

$Distance=\sqrt{(8-5)^2+(6-7)^2} =\sqrt{9+1} =\sqrt{10}=3.162$

Find length of BC

⇒ first point: (8,6)

⇒ second point: (3,3)

$Distance = \sqrt{(3-8)^2+(3-6)^2} =\sqrt{25+9} =\sqrt{34}=5.831$

Now let's solve for the perimeter:

$Perimeter = 4.472+ 3.126+ 5.831=13.429$

Answer: 13.43 (rounded to the nearest hundredth)

Hope that helps!

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