Evaluate 3bc -2a to the second power when a=2, b=3 and c=4 3abc-2a to the second power
3 (3)(4)- 2 (2) to the second power
9 (4) -2 (2) to the sec.power
36 -2 (4)
36 -8
=28
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4. Find the area of the fiqure:
( I can't draw the fiqure BUT: take a small envelope and open up with the flap laying flat down. The base of the envelope is 6 ft, the side of the envelope is 4.2 and the top where you lick it draw that part in half and that is the 3 ft.)
A = LW - 1/2bh
=(4.2ft x 6 ft) - 1/2 x 6 ft x 3 ft
= 25.2 ft - 9 ft
= 24. 3 ft
is this correct?
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