The sum of x and y=x+y
their product=xy
Therefore the expression is
(x+y)-(xy)
If you mean to say to find the 11th term, then know that this is an arithmetic sequence (where you have a common difference).
The common difference in this case is -2.
The formula for finding any term in an arithmetic sequence (specifically the explicit formula) is:
where a_n is the term, a_1 is the first term, n is the term number (position) and d is the common difference.
Let's substitute the corresponding values to the formula.
The 11th term is -17.
As the question says, the longest blue whale was about 18 scuba divers in length.
We are supposed to use breaking apart to estimate the length of that blue whale.
Now, the average height of a scuba diver is 165.5 centimeters.
The length is roughly equivalent to the length of 18 scuba divers.
Therefore, the combined length of 18 scuba divers is :
Hence, the length of the blue whale is about 2979 cm.
We can also convert centimeters into meters by dividing the centimeters by 100.
We get,
So the length of the blue whale in meters is 29.79 meters.
Let x be the number of tickets sold to adults and y the number sold to students:
x + y = 315. But we know that y was double x, then :
y = 2x
Plug the value of y (in the 1st equation) by 2x:
x+ 2x = 315
3x = 315
and x = 105 (which is the number of tickets sold to adults
10⁹ + 10⁸ + 10⁷ = 10⁷ (10² + 10¹ + 10⁰)
… = 10⁷ (100 + 10 + 1)
… = 10⁷ × 111
… = (2 × 5)⁷ × 111
… = 2⁷ × 5⁷ × 111
… = 2⁷ × 5⁶ × 555