The expression can be simplified as follows:
a. (-4)(-2) -6(2 - 5) = 26
b. 12.7 - 18.5 + 15 + 6.3 - 1 + 28.5 = 43
c. 23 - (17 - 3.4)² + 6 = -155.96
How to solve an expression using PEMDAS rule?
The expressions can be solved using PEMDAS rule,
P = Parenthesis
E = Exponential
M = Multiplication
D = division
A = addition
S = Subtraction
Hence,
a.
(-4)(-2) -6(2 - 5) = (-4)(-2) - 6(-3) = 8 + 18 = 26
b.
12.7 - 18.5 + 15 + 6.3 - 1 + 28.5 = -5.8 + 15 + 6.3 - 1 + 28.5 = 9.2 + 6.3 - 1 + 28.5 = 15.5 - 1 + 28.5 = 14.5 + 28.5 = 43
c.
23 - (17 - 3.4)² + 6 = 23 - (13.6)² + 6 = 23 - 184.96 + 6 = -161.96 + 6 = -155.96
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