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irakobra [83]
3 years ago
7

Simplify 4-(5-2) 4(6-2)÷2

Mathematics
1 answer:
user100 [1]3 years ago
6 0
-20 
i however do not and will not explain just know i have a scientific calculator<span />
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A cell phone cost $210 a battery charger costs $15 and batteries cost $5 .what is the sales tax and total price for purchasing t
Savatey [412]

The total price with sales tax is $ 246.1

<h3><u>Solution:</u></h3>

Cost of cellphone = $ 210

Cost of battery charger = $ 15

Cost of batteries = $ 5

So total cost can be calculated by adding cost of cellphone and Cost of battery charger and Cost of batteries

Total cost = 210 + 15 + 5 = $ 230

Given that sales tax is 7%

sales tax = 7% of total cost

sales tax = 7 % of 230

\text {sales tax }=\frac{7}{100} \times 230=16.1

Total cost including sales tax = 230 + 16.1 = $ 246.1

Thus the total price with sales tax is $ 246.1

3 0
3 years ago
Write the equation for an ellipse with the center at the origin, a vertical major axis of length 30, and a horizontal minor axis
velikii [3]

Answer:

C

Step-by-step explanation:

hope that helps

7 0
3 years ago
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Calculate the average rate of change over the intervals [0, 20] and [60, 80]. What does the average rate on these intervals tell
Assoli18 [71]

\frac{20 - 80}{0 - 60 }  = slope \: or the \: rate \: of \: \\  change \:  \\  \\      \frac{ - 60}{ - 60}  = 1
It tells you that over these intervals the balloon is going at a constant speed.
4 0
3 years ago
Find the length of side xx in simplest radical form with a rational denominator.
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Answer:

2/3.

Step-by-step explanation:

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7 0
3 years ago
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Show that the sum of the first 2n natural numbers is n(2n+1)
Leokris [45]

Answer:

This sum is the sum of an arithmetic sequence.  There is a formula for the sum of an arithmetic sequence which can be looked up or derived by a variety of means.

A nice approach for this sequence is the following.  Notice  that the sum of first and last number in the sequence is the same as the sum of the second and second last, and also the same as the sum of the third and third last, and so on.

There are n of these pairs.  So the desired sum is n x (first number + last number).   But the first number is 1 and the last on is 2n.   Thus the desired sum is n(1 + 2n).

Hope this helps!!

Mark Brainleast!!!!!!!!!!!

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2 years ago
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