Fiona and her dad love making paper airplanes. on saturday morning, fiona made 12 paper airplanes, and her dad made 8 paper airplanes. that afternoon, they made more planes, which doubled their number of planes from the morning. at the end of the day, fiona her little brother make 3more paper airplanes. write a numerical expression with parentheses for the total number of paper airplanes fiona and her family made. do not simplify your expression.

2(12+8) +3

Step-by-step explanation: In the morning they made 12 + 8 airplanes = (12 + 8)

In the afternoon they doubled the number that they made in the morning = 2 (12 + 8)

Finally, you would add 3 to this for the ones that her brother made = 2 (12 + 8) + 3

geometry: triangles

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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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