15.
[tex] {(2x)}^{3} \times 3 {x}^{2} \\ = 8 {x}^{3} \times 3 {x}^{2} \\ = (8 \times 3) {x}^{3 + 2} \\ = \blue{\boxed{24 {x}^{5} }}[/tex]
16.
[tex] {( - 2)}^{2} + {8}^{2} \\ = 4 + 64 \\ = \blue{ \boxed{68}}[/tex]
17.
[tex] \blue{ \boxed{powers \: of \: a \: product}}[/tex]
18.
[tex] {(36 {y}^{2} )}^{0} = \blue{ \boxed{1}}[/tex]
Explanation: Any number raised to zero is equal to 1.
19.
[tex] {x}^{0} + {y}^{0} - 2 {x}^{0} \\ = 1 + 1 - 2(1) \\ = 2 - 2 \\ = \blue{ \boxed{0}}[/tex]
20.
[tex] {(2x)}^{3} = {2}^{3} {x}^{3} = \blue{ \boxed{8 {x}^{3} }}[/tex]
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