Answer:
1. 424
2.471
3.512
Step-by-step explanation:
1. 10×12+8×10+8×13+8×15
=120+80+104+120
=424
2. 5×24+9×24+9×15+9×15
=120+216+135
=471
3. 24×16+2×24+2×20+2×20
=384+48+40+40
=512
= 3
x = 4.75 or 19/4 or 4 and 3/4
10 - 4x = -9
-10 -10
-4x = -19
---- -----
-4 -4
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