How much miles is a light year

1 answer:

8 0

1 light-year = roughly 5,874,601,700,000 miles. (rounded)

To work it out, take the speed of light, and change units a few times:

      (186,282.397 miles/second)
times
          (86,400 second/day)
times
          (365 day/year)

=   (186,282.397 x 86,400 x 365) mile/year .

You can whip that out on your calculator in no time.

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A friend has a 83% average before the final exam for a course. That score includes everything but the final, which counts for 25

Klio2033 [76]

Answer:

$\mathrm{Best\:course\:grade\:possible:\:}87.25\%,\\\mathrm{Minimum\:score\:on\:final\:to\:earn\:at\:least\:a\:75\%\:for\:the\:course:\:}51\%$

Step-by-step explanation:

Assuming the maximum score for the final is $100\%$ , we can multiply each score by its respective course weight and add them together to give a final score. If your friend did receive this maximum score of $100\%$ , their overall grade for the course would be:

$83(1-0.25)+100(0.25)=\fbox{$87.25\%$}$ .

To find the minimum score they need to earn a 75% for the course, we set up the following equation:

$83(1-0.25)+x(0.25)=75$ , where $x$ is the minimum score she needs.

Solving, we get:

$62.25+x(0.25)=75,\\x(0.25)=12.75,\\x=\fbox{$51\%$}$ .

8 0

2 years ago

A car travels 360 miles in a period of 180 minutes. Find the average velocity of the car in miles per hour over this time period

Serggg [28]

The simple formula for velocity is v=d/t. Velocity equals distance divided by time. 360 miles divided by 180 minutes. 360/180=2. The car travels at 2 miles per MINUTE.

Now, to change to miles per HOUR. There are 60 minutes in an hour, so 2*60=120 miles per hour.

Answer: 120 mph

4 0

3 years ago

Read 2 more answers

4. *Each pair of polygons is similar. Find the value of x.

torisob [31]

Step-by-step explanation:

since both objects and sides are similar, you can set each side equal, then you cross multiply, and do subtraction, then find x.