The answer is A because if X represents the # of packages sold on Monday, then Tuesday can be represented by x+4 and Wednesday by x+6. Add the three expressions to get 3x+10=28, subtract 10 from both sides. 3x=28, divide by 3 and get x=6

4 0

3 years ago

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Which of the following has no solution?

Evgen [1.6K]

A)

$\{x\,|\,x \leq 1\}\, \cap \,\{x\,|\,x \geq 1\}=(-\infty;1]\,\cap\,[1,\infty)=\{1\}$

b)

$\{x\,|\,x \ \textless \ 1\}\, \cap \,\{x\,|\,x \ \textgreater \ 1\}=(-\infty;1)\,\cap\,(1,\infty)=\boxed{\emptyset}$

c)

$\{x\,|\,x \leq 1\}\, \cup \,\{x\,|\,x \geq 1\}=(-\infty;1]\,\cup\,[1,\infty)=\mathbb{R}$

Answer b)

7 0

3 years ago