(y^11)(y^2)^8 + y^x what is the value of x?
1 answer:
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Answer:
The answer is (C) 8
Step-by-step explanation:
First, let's calculate the length of the side of the square.
, where
is the length of the side. Now, let's try to build the square. First we need to find a point which distance from (0, 0) is 10. For this, we can use the distance formula in the plane:
which for
and
transforms as
. The first point we are looking for is connected to the origin and therefore, its components will form a right triangle in which, the Pythagoras theorem holds, see the first attached figure. Then,
,
and 10 are a Pythagorean triple. From this,
or
while
or
. This leads us with the set of coordinates:
and
. (A)
The next step is to find the coordinates of points that lie on lines which are perpendicular to the lines that joins the origin of the coordinate system with the set of points given in (A):
Let's do this for the point (6, 8).
The equation of the line that join the point (6, 8) with the origin (0, 0) has the equation , however, we only need to find its slope in order to find a perpendicular line to it. Thus,
Then, a perpendicular line has an slope (perpendicularity condition of two lines). With the equation of the slope of the perpendicular line and the given point (6, 8), together with the equation of the distance we can form a system of equations to find the coordinates of two points that lie on this perpendicular line.
(1)
(2)
This system has solutions in the coordinates (-2, 14) and (14, 2). Until here, we have three vertices of the square. Let's now find the fourth one in the same way we found the third one using the point (14,2). A line perpendicular to the line that joins the point (6, 8) and (14, 2) has an slope based on the perpendicularity condition. Thus, we can form the system:
(1)
(2)
with solution the coordinates (8, -6) and (20, 10). If you draw a line joining the coordinates (0, 0), (6, 8), (14, 2) and (8, -6) you will get one of the squares that fulfill the conditions of the problem. By repeating this process with the coordinates in (A), the following squares are found:
- (0, 0), (6, 8), (14, 2), (8, -6)
- (0, 0), (8, 6), (14, -2), (6, -8)
- (0, 0), (-6, 8), (-14, 2), (-8, -6)
- (0, 0), (-8, 6), (-14, -2), (-6, -8)
Now, notice that the equation of distance between the two points separated a distance of 10 has the trivial solution and
. By combining this points we get the following squares:
- (0, 0), (10, 0), (10, 10), (0, 10)
- (0, 0), (0, 10), (-10, 10), (-10, 0)
- (0, 0), (-10, 0), (-10, -10), (0, -10)
- (0, 0), (0, -10), (-10, -10), (10, 0)
See the attached second attached figure. Therefore, 8 squares can be drawn
Answer:
Option E - None of these answers is reasonable.
Step-by-step explanation:
To find : Convert 17.42 m to customary units ?
Solution :
The customary units is defined as the measure length and distances in the customary system are inches, feet, yards, and miles.
The options belong to feet and inches.
We have to convert meter into inches, feet.
Meter into feet,
Now, Feet into inches
i.e.
or
None of these answers is reasonable.
Therefore, Option E is correct.
Answer:
The alcohol concentration of the resulting solution is 58.4%
Step-by-step explanation:
- At first we must to find the quantity of pure alcohol in the 8 liters
∵ The alcohol concentration is 48% in 8 liters
∴ The quantity of pure alcoholic = liters
- She added 2 liters pure alcohol to the solution that means the solution
increased by 2 liters and alcohol quantity increased by 2 liters
∵ She added 2 liters pure alcohol
∴ The quantity of pure alcohol = 2 + 3.84 = 5.84 liters
∴ The resulting solution = 2 + 8 = 10 liters
- Now we need to find the concentration of alcohol in the resulting
solution
∵ The quantity of pure alcohol = 5.84 liters
∵ The resulting solution = 10 liters
∴ The concentrate of alcohol = % = 58.4%
The alcohol concentration of the resulting solution is 58.4%