Answer:
a) 21
b) 3905.44236
c) 251.94689
d) 1763.62824
Explanation:
a) 42÷2=21
b) 60x42=2520
r²=1385.44236
2520+1385.44236=3905.44236
c) 2xx21=131.94689+60+60=251.94689
d) 251.94689x7=1763.62824
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