⦁explain the difference between  ""4  times the sum of  x  and  y""  and ""the sum of  4  times  x  and  y.""

In the first case, you perform the sum and then multiply by 4:

The sum of x and y ---> x+y

Four times the sum of x and y --->4(x+y)

In the second case, only x is multiplied by 4:

4 times x > 4x

The sum of 4 times x and y ---> 4x+y

the answer is 15% decrease

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