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?