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Reika [66]
3 years ago
12

5r2 - 8r =0the 2 is quared.​

Mathematics
1 answer:
melamori03 [73]3 years ago
6 0

Answer:

{0, 8/5}

Step-by-step explanation:

Please present this  5r2 - 8r =0  as 5r^2 - 8r = 0   or as  5r² - 8r = 0.

Factoring out the r, we get                             r(5r - 8) = 0.

Setting each factor = 0 separately and finding r in each case, we get:

r = 0 and

5r = 8, so that r = 8/5.

The roots of this polynomial equation are {0, 8/5}.

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Don went to his favorite restaurant and ordered a meal. His bill came out to $15.77. He wants to pay a 15% tip. How much did he
melamori03 [73]
You want to leave a 15% tip on a meal that cost $15.77.
First, convert the 15% to an actual number that can be used in a calculation. For percents,this is always done by simply dividing the percent (in this case 15%) by 100%.So, the conversational term "15%" becomes 15% / 100% = 0.15 in terms of a real mathematical number.
Second, you need to find out what 15% of your $15.77 meal cost is.This is always done by multiplying 0.15 by $15.77, or

0.15 x $15.77=$2.37.
So, the amount of tip you are going to leave is $2.37.

This makes the total cost of your meal (to write on your charge slip or other payment)

$15.77 + $2.37 = $18.14

$18.14 is your answer
5 0
3 years ago
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7 0
4 years ago
Read 2 more answers
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Rudik [331]

Answer:

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Step-by-step explanation:

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8 0
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III
WARRIOR [948]

Answer:

  • n = 115.6

Step-by-step explanation:

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Step-by-step explanation:

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All the angles of a triangle need to add up to 180 degrees.

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