Answer:
12:15 is NOT proportional to 3:4
Step-by-step explanation:
7.5:10 is proportional to 3:4 because 3×2.5=7.5, and 4×2.5=10.
39:52 is proportional to 3:4 because 3×13=39, and 4×13=52
45:60 is proportional to 3:4 because 3x15=45, and 4×15=60
12:15 is not proportional to 3:4 because while you can multiply 3x4=12, you can not multiply 4×4 to get 15, you get 16 instead.
the easiest way I find a midpoint of two points is the midpoint theorem, here it is:

For x and y plug in the two coordinates given, (4,-4) & (0,8)
so once you plug the numbers into the equation you would get:
(2,2)
Distance = rate times time. Thus,
d = (68 mph) (5.25 hrs) = 357 miles (answer)
If you would like to solve 7x - (25x^2 + 12x), you can do this using the following steps:
7x - (25x^2 + 12x<span>) = 7x - 25x^2 - 12x = - 25x^2 - 5x
</span>
The correct result would be <span>- 25x^2 - 5x.</span>
Let's first write down all the information given in <em>y = mx + b</em> form. Notice that x-intercept means that <em>y = 0</em> at that point. <em>b</em> is not given, so:

Let's solve for b:


Now we have the equation:

We can plug in every option given to see which choice makes it true:
<u>(0, 30)</u>


<u>(5, 15)</u>



<u>(10, 10)</u>


<u>(-5, 60)</u>


Therefore, choice D or <u><em>(-5, 60)</em></u> is your answer. Hope I could help! :)
<em>*There is probably an easier way to solve this, I just didn't see it when I attacked the problem! :) </em>