Answer:
{ - 2, 10 }
Step-by-step explanation:
Given
x² - 8x = 20
To complete the square
add ( half the coefficient of the x- term )² to both sides
x² + 2(- 4)x + 16 = 20 + 16, that is
(x - 4)² = 36 ( take the square root of both sides )
x - 4 = ± = ± 6 ( add 4 to both sides )
x = 4 ± 6
Thus
x = 4 - 6 = - 2
x = 4 + 6 = 10
Answer:
4 days and 18 hours.
Step-by-step explanation:
1440 Watt hours = 1 day
6840 Watt hours = x
<em>Cross multiply.</em>
1440*x = 6840*1
1440x = 6840
<em>Divide both sides by </em><u><em>1440.</em></u>
1440x/1440 = 6840/1440
x = 4.75 days
4.75 days is <u>4 days and 3/4 of a day; because 3/4 = 0.75</u>
<em>We have to find 3/4 of 1 day.</em>
<u>1 day is 24 hours.</u>
3/4* 24
<em>Divide 24 by 4.</em>
3*6 = 18
So, 18 hours.
Therefore a light bulb consumes 6840 Watt hours in 4 days and 18 hours.
I hope this helps. please give brainliest, thank and rate 5 stars.
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Answer:
x = 10.9
Step-by-step explanation:
Since the triangle is right, use the tangent ratio to find the value of x
tan36° = = =
Multiply both sides by 15
15 × tan36° = x
⇒ x = 10.9 ( to nearest tenth )
So I’ll give you he method please mark brainiest :)
Range: take the largest number and subtract the smallest number you have
Mean: add all the numbers together and divide it by the amount of numbers there were
Mode: the number that appears most often so multiple times
Median: To find the median, put all numbers into ascending order and work into the middle by crossing off numbers at each end. If there are a lot of items of data, add 1 to the number of items of data and then divide by 2 to find which item of data will be the median.
Please mark as brainiest :)))