Answer:
5d - 9
Step-by-step explanation:
Step 1: Write equation
(2d + 3) + (3d - 12)
Step 2: Combine like terms
5d - 9
3:5.....added = 8
3/8(40) = 120/8 = 15 m <== one piece
5/8(40) = 200/8 = 25 m <== the other piece
Answer:
Senny: 45 mph; Farouk: 35 mph
Step-by-step explanation:
Their combined speed is 520 mi/(6.5 h) = 80 mi/h. Senny's speed is half the sum of this and the difference of 10 mi/h:
... (80 mi/h + 10 mi/h)/2 = 45 mi/h
Farouk's speed is 10 mi/h less:
... 45 mi/h - 10 mi/h = 35 mi/h
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<em>Comment on Sum and Difference Problems</em>
If two numbers <em>a</em> and <em>b</em> have a sum of <em>s</em> and a difference of <em>d</em>, you can write equations ...
Adding these two equations gives ...
... 2a = s + d
Dividing this by 2 gives
... a = (s + d)/2 . . . . . . the formula we used above
Answer:
area = 45
Step-by-step explanation:
triangle = 7*6. / 2 = 21
rectangle 4*6=24
24+21= 45ft squared
It's still 36% because you droppet it and then gain it back up