Final answer:
To evaluate expressions with given values, substitute the values into the expression and perform the arithmetic calculations. In question 5, the expression mx - y is evaluated as 9 when m = 2, x = 7, and y = 5. In question 6, the expression 3a + 15 + b/c - 6 equals 30.2 when a = 7, b = 3, and c = 15.
Step-by-step explanation:
QUESTION 5:
To evaluate the expression mx - y, we substitute the given values for m, x, and y into the expression. Since m = 2, x = 7, and y = 5, we can replace the variables with the corresponding values:
2(7) - 5 = 14 - 5 = 9
Therefore, the expression mx - y, when m = 2, x = 7, and y = 5, is equal to 9.
QUESTION 6:
To evaluate the expression 3a + 15 + b/c - 6, we substitute the given values for a, b, and c into the expression. Since a = 7, b = 3, and c = 15, we can replace the variables with the corresponding values:
3(7) + 15 + 3/15 - 6 = 21 + 15 + 0.2 - 6 = 30.2
Therefore, the expression 3a + 15 + b/c - 6, when a = 7, b = 3, and c = 15, is equal to 30.2.
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