I think Mold B
Sorry If its wrong
To find the mean/average of a set of numbers, add them all together then divide by the number of numbers.
249 + 449 + 269 + 259 + 329 = 1555
1555/5 = 311
The answer is $311
Hope this helped! If you have anymore questions or don't understand, please comment or DM me. :)
Answer:
a. (53, 12)
b. I couldn't find this without making a graph myself, hopefully someone will find it or you can figure it out for yourself using the answer I did provide.
Translate the info given into equations:
<span>A positive integer is 15 less than another -----> x = y - 15
</span><span>If 4 times the reciprocal of the smaller integer is subtracted from the reciprocal of the larger integer, then the result is − 3/4
</span>------> (1/y) - (4/x) = -3/4
Use substitution, replace 'x' with 'y-15' in 2nd equation
![\frac{1}{y} - \frac{4}{y-15} = -\frac{3}{4} \\ \\ \frac{ (y-15)-4y}{y(y-15)}=-\frac{3}{4} \\ \\ 4(-3y-15) = -3y(y-15) \\ \\ -12y -60 = -3y^2+45y \\ \\ 3y^2-57y-60 = 0 \\ \\ y^2-19y -20 =0 \\ \\ (y-20)(y+1) = 0 \\ \\ y = 20,y=-1](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7By%7D%20-%20%5Cfrac%7B4%7D%7By-15%7D%20%3D%20-%5Cfrac%7B3%7D%7B4%7D%20%5C%5C%20%20%5C%5C%20%5Cfrac%7B%20%28y-15%29-4y%7D%7By%28y-15%29%7D%3D-%5Cfrac%7B3%7D%7B4%7D%20%5C%5C%20%20%5C%5C%204%28-3y-15%29%20%3D%20-3y%28y-15%29%20%5C%5C%20%20%5C%5C%20-12y%20-60%20%3D%20-3y%5E2%2B45y%20%5C%5C%20%20%5C%5C%203y%5E2-57y-60%20%3D%200%20%5C%5C%20%20%5C%5C%20y%5E2-19y%20-20%20%3D0%20%5C%5C%20%20%5C%5C%20%28y-20%29%28y%2B1%29%20%3D%200%20%5C%5C%20%20%5C%5C%20y%20%3D%2020%2Cy%3D-1)
We know that both x and y must be positive integers, so y =-1 is not a solution.
If y=20, then x = 20-15 = 5
Final answer:
The pair of integers is (5,20)