Options? Is this multiple choice?
Answer:
Rs 1425
Step-by-step explanation:
=(30×40) + (15×15)
=1425
<span>The question is asking us to write a function that represents the total number of words ( y ) that Mrs. Garcia can type in x minutes. Then we have to calculate how many words she can type in 49 minutes. In 1 minute she can type 70 words, in 2 minutes 140 etc. Answer: the function is: y = 70 * x. In 49 minutes ( x = 49 ) : y = 49 * 70 = 3,430. In 49 minutes she would type 3,430 words. </span>
We know this is an upside down parabola because the vertex is higher than the point. So it will have a negative leading coefficient or "a" value. We have this then as our standard form:
where h and k are the coordinates of the vertex and x and y are the coordinates of the point. We will fill in our standard equation with those values and solve for a, then rewrite. Here's what we have so far:
. Simplifying that will give us -9=a(81)+6. Subtract 6 from both sides and we solve to find that a=-5/27. See, that's how we know it's upside down. Our a value is solved as a negative. Now, put that value of a back in along with the vertex to get a final equation of