4.
[tex] \frac{5(14-2)^{2}}{2} [/tex]
By the order of operations (parentheses, exponents, multiplication, division, addition, subtraction), we must get rid of the parentheses first.
Subtract 2 from 14.
[tex] \frac{5*12^{2}}{2} [/tex]
Next is exponents. Square 12.
[tex] \frac{5*144}{2} [/tex]
Multiply.
[tex] \frac{720}{2} [/tex]
Divide.
Answer: 360
5.
u + xy if u = 18, x = 10, and y = 8
Substitute.
u + xy
18 + 10(8)
Multiply.
18 + 80
Add.
98
Answer: 98
