Try this: Combine 6 and 9, obtaining 15.
Compare this sum, 15, to the length of the 3rd side: 15.
If placed end to end, the 2 sides with lengths 6 and 9 form a new line of length 15. We'd end up with this new line superimposed on the 3rd side (with length 15).
Think: Do 2 straight lines of length 15, superimposed on one another, form a triangle?
40/50 is the ratio because the cos formula is adjacent over hypotenuse and you can reduce it to 4/5 as a fraction :)
Answer:
4778.69 +d-z+b
Step-by-step explanation:
Initial balance of the joint checking account = $6238.67
Deposits in a month gets added in the account = d dollars
Maintenance fee is deducted in the account = z dollars
Interest on the account is added in the account balance = b dollars
Checks written also gets deducted form the account = $1459.98
Algebraic expression so formed is
6238.67 + d -z+b-1459.98
4778.69 +d-z+b
100 feet left. A yard is 3 feet. Theres 5 yards in 8 pieces. 5*3=15 and 15*8=120. He uses 4 pieces that are 5 feet. 5*4=20. He uses 20 feet. 120-20= 100.