Answer:
D.
Step-by-step explanation:
Pretend the y-axis is a wall, on the left side it is decreasing and on the right it is increasing, so A. and B. aren't correct. C. and D. are left, x<0 means on the left side of the y-axis because x (any number) is less than 0 and on the left side it is decreasing so C. isn't correct so D. is your answer because x>0 means x is greater than 0 so it's on the left side of the y-axis.
I hope this helps!
Y=-8x count the differences between the x's and y's from each point. y-int is at 0
You have to figure this out my adding 9 points to how many points Mary has, to get how many points Alice has, with an answer of 30 points. <span />
Result
You entered the following points:
<span>A = <span>(<span> 1 , 2 </span>)</span></span>
<span>B = <span>(<span> −9 , 3 </span>)</span></span>
<span>The distance between points A
and B
is :</span>
<span>d(A,B)=<span>101<span>−−−</span>√</span> ≈ 10.0499</span>
Explanation
To find distance between points <span>A(<span>xA</span>,<span>yA</span>)</span>
and <span>B(<span>xB</span>,<span>yB</span>)</span>
, we use formula:
<span>d(A,B)=<span><span>(<span>xB</span>−<span>xA</span><span>)2</span>+(<span>yB</span>−<span>yA</span><span>)2</span></span><span>−−−−−−−−−−−−−−−−−−−</span>√</span></span>
In this example: <span><span>xA</span>=1</span>
, <span><span>yA</span>=2</span>
, <span><span>xB</span>=−9</span>
and <span><span>yB</span>=3</span>
so:
<span><span><span>d(A,B)</span><span>d(A,B)</span><span>d(A,B)</span></span><span><span>=<span><span><span><span>(<span>−9−1</span>)</span>2</span>+<span><span>(<span>3−2</span>)</span>2</span></span><span>−−−−−−−−−−−−−−−−</span>√</span></span><span>=<span><span>100+1</span><span>−−−−−−</span>√</span></span><span>=<span>101<span>−−−</span><span>√</span></span></span></span></span>
So we have $250 spent, so we get 25% off of that.
To find 25% of 250 we have to do 250 × 0.25, which is 62.5.
Amy will save $62.50.
