How to systematically enumerate all possibilities of +b)+c)+d)+e? i know that when (a+b)+c=a+(b+c) then to do ((a+b)+c)+d =(a+b)+(c+d) < --"counted" all possible outer brackets =(a+(b+c))+d < -- just "slide" the brackets off =a+((b+c)+d) a+(b+(c+d)) < -- by finish '"sliding" i should get the originals questions mirror image as a result.

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

Give the functions f(x) = |x + 2| - 3, what is the domain? a,b,c, or d all real numbers x > 2 x < -2 all real numbers and x cannot equal to 2

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)