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2 years ago

Find the total cost of a $20 lunch with an 18% tip.

Mathematics

1 answer:

Pachacha [2.7K]2 years ago

8 0

Answer:

$23.6

Step-by-step explanation:

The lunch normally costs $20

But you give a 18% TIP on top of that

Certainly, it will cost more. Lets find out how much exactly.

First, we need to find 18% of 20 and then ADD it to 20 to find FINAL LUNCH COST.

To convert percentage to decimal, we divide by hundred. After that we multiply with 20 to get 18% of 20. Process shown belowL

18% = 18/100 = 0.18

Then,

0.18 * 20 = $3.6

Adding to $20, we get total cost:

20 + 3.6 = 23.6 dollars

Total Cost = $23.6

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3 years ago

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The teacher asked 4 students to measure 4 different objects. The table shown represents their measurements. Which student had th

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Student 4 has the largest percent error.

Step-by-step explanation:

The percent error of a measurement is given by

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where

x is the value of the measurement

$x_{true}$ is the actual value

For student 1:

$x=49\\x_{true}=50$

Percent error:

$p=\frac{|49-50|}{50}\cdot 100=0.02\cdot 100=2\%$

For student 2:

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Percent error:

$p=\frac{|25.5-25|}{25.5}\cdot 100=0.0196\cdot 100 = 1.96\%$

For student 3:

$x=7.5\\x_{true}=8$

Percent error:

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For student 4:

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Percent error:

$p=\frac{|2.1-1.6|}{1.6}\cdot 100=0.3125\cdot 100 = 31.25\%$

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3 years ago

What is the area of the figure?

son4ous [18]

Yes. 95 is correct.
You have three congruent "indentations" in the right hand side. Thus each section must be 15/3 = 5 cm long.
The top rectangle will be 8*5 = 40 cm^2
The bottom rectangle will also be 8*5 = 40 cm^2
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3 years ago

Show that one zero of 8x230x27 is the square of the other.

murzikaleks [220]

Answer:

8x2-30x+27 has one root (9/4) the square of the other (3/2)

Step-by-step explanation:

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One is not the square of the other because squares are positive.

8x2-30x+27 = (2*x-3)*(4*x-9) =>

solution = {3/2, 4/9} since (4/9 = (3/2)^2, therefore the preceding question is correct.

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3 years ago

715 miles in 11 hours how long would it take to drive 845 miles

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2 years ago