The old mean was 51 now the mean is 42.33... (round that to 42) 51 - 42 = 9
Answer:
20
Step-by-step explanation:
5(1)= 5; identity property of multiplication
(3+5)+0=(3+5); identity property of addition
[3(5)](4)=(3)[5(4)]; associative property of multiplication
3+5=5+3; commutative property of addition
3+(5+7)=(3+5)+7; associative property for addition
hope this helps :)
Answer:
a. 180
Step-by-step explanation:
= 
cross-multiply:
4x = 720
x = 180
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