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3 years ago

13

The science club is ordering T-shirts by mail. The shirts cost $12 each and there is a $4 shipping charge. The function C = 4 +

12s shows the total cost C of ordering T-shirts. What will be the total cost of 10 T-shirts?
164
124
120
160

1 answer:

Lisa [10]3 years ago

8 0

The total cost of ordering 10 shirts can be calculated as following:

C = 4 + 12(10)

C = 4 + 120

C = 124

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Answer:

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Step-by-step explanation:

Given that $y = 5\cdot x + 11$ and $t = 2-x$ , the parametric equations are obtained by algebraic means:

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5) $y = [5\cdot (-1)^{-1}]\cdot [(-1)\cdot x]+11$ Associative property

6) $y = -5\cdot (-x)+11$ $\frac{a}{-b} = -\frac{a}{b}$ / $(-1)\cdot a = -a$

7) $y = -5\cdot (-x+0)+11$ Modulative property

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11) $y = (-5)\cdot (2-x) +21$ $(-a)\cdot (-b) = a\cdot b$

12) $y = (-5)\cdot t +21$ By 1)

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15) $t +(-t) +x = (2-x)+x +(-t)$ Compatibility with addition

16) $[t+(-t)]+x= 2 + [x+(-x)]+(-t)$ Associative property

17) $0+x = (2 + 0) +(-t)$ Associative property

18) $x = 2-t$ Associative and commutative properties/Definition of subtraction/Result

In consequence, the right answer is $x = 2-t$ and $y = -5\cdot t +21$ .

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