Nine less than five times a number is equal to 30.

5x - 9 = -30

Step-by-step explanation: "Five times a number" means 5* unknown number = 5x

5x - 9 = -30

"Nine less than" means - 9

"Five times a number" means 5*unknown number = 5x

Hope this helps

y=mx+b

step-by-step explanation:

m is slope, b is y-intercept

geometry: triangles

solvers

lessons

answers archive

call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

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