Question

28 mn -5n+2mесли m=0,2и n=0,3 2)2(3x+5)-3(4x-15)если x=6,5

Answer 1

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Answer 2

To evaluate the expressions, simply substitute the given values for the variables and perform the calculations.

1. Given expression: 28m - 5n + 2m

When m = 0.2 and n = 0.3, we can plug these values into the expression:

28(0.2) - 5(0.3) + 2(0.2)

Now, perform the calculations:

5.6 - 1.5 + 0.4

Finally, add and subtract to get the result:

5.6 - 1.5 = 4.1

So, when m = 0.2 and n = 0.3, the expression evaluates to 4.1.

2. Given expression: 2(3x + 5) - 3(4x - 15)

When x = 6.5, we can plug this value into the expression:

2(3(6.5) + 5) - 3(4(6.5) - 15)

Now, perform the calculations inside the parentheses first:

2(19.5 + 5) - 3(26 - 15)

Next, continue with the calculations:

2(24.5) - 3(11)

Now, calculate the multiplications:

49 - 33

Finally, subtract to get the result:

49 - 33 = 16

So, when x = 6.5, the expression evaluates to 16.