To find this, just plug the numbers into the expressions.
5x = y
5(2) = 7
10 = 7
So it can't be A.
x + 2 = y
2 + 2 = 7
4 = 7
x + 4 = y
2 + 4 = 7
6 = 7
2x + 3 = y
2(2) + 3 = 7
7 = 7
The correct answer is
D. 2x + 3
Perfect squares can be divided and multiplied by the same number to get the same number. For example 25/5=5. 5*5=25.
4/2=2, 2*2=4
1/1=1, 1*1=1
9/3=3, 3*3=9
16/4=4, 4*4=16.
Hence the perfect squares.
The answer would be the first image.
Step-by-step explanation:
From context, it appears that to be circumscribed is to be drawn about; thus the square circumscribed about the circle is the first graph.
A unit circle has radius 1, and thus circumference 
.
Since an angle of 
is one eighth of a whole turn, the length of an arc that subtends an angle of radians will be one eighth of the whole circumference:
In fact, the radians have the property that, in the unit circle, the length of the arc is exactly the measure of the angle. In general, you have
where l is the length of the arc, r is the radius and 
is the angle in radians. So, if 
, you have 
