Respuesta :

1) 8
2) 14.5*2=29
3) 7x+5=2*13,     7x+5=26, 7x=21, x=3
4)d(1)=2r, 
if r increase 3 times, d(2)=2*(3r)
d(2)/d(1)=(2*3r)/2r=3,
so diameter increases 3 times

Catya
1. each point on star has a radius, line extending through from the center to outer edge of the circle. 8 radii

2. diameter is twice the radius. 2 * 14.5 = 29

3. diameter is 2 * 13 = 26
26 = 7x + 5
26 - 5 = 7x
21 = 7x
3 = x

4. diameter, d = 2r
increased 3 times is multiplication.
d = 2(3r)
diameter is also increased 3 times

5. The developers can run a series of tape from the edge of the circle path to the other side directly across. Several lines of tape across the diameter.. like the star in question 1. The center is where the lines of tape cross each other.


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