Period would be the distance between 2 peaks
looking at the graph there is a peak on x= 1 and then a peak on x= 4
4-1 = 3 so the peak is 3
the amplitude is the midpoint between the highest point and lowest point
on the graph
the high point is y=1 and the low point is y = -2
1 + -3 = 3 spaces, midpoint = 3 / 2 = 1.5 so the amplitude = 1.5
the answer is the first one.
This question is basically asking what is 6°C - 10°C, which comes out to be -4°C
Let x be the time she ran and y be the time she walked
then distance ran = 25x and distance walked = 5y
so 15x + 5y = 42
and x + y = 4
* second equn. by -5:-
-5x - 5y = -20
add this to the first equn:0
10x = 22
x = 2.2
distance she ran = 2.2 * 15 = 33 km
Its a because you have to do the change in y over the change in x which is
y2-y1
------
x2-x1
