Expression contains numbers, variables, and mathematical operations. The expression that has the value of 15 when n = 7 is 19-28/n.
In mathematics, an expression is defined as a set of numbers, variables, and mathematical operations formed according to rules dependent on the context.
In order to know the expression that has a value of 15 when n = 7, substitute the value of n in each expression.
a.) 43-5n
[tex]43-5n\\\\=43-5(7)\\\\=43-35\\\\=8[/tex]
b.) 3n - 5
[tex]3n-5\\\\=3(7)-5\\\\=21-5\\\\= 16[/tex]
c.) 6n - 28
[tex]6n-28\\\\=6(7)-28\\\\=42-28\\\\=14[/tex]
d.) 19 - 28/n
[tex]19-\dfrac{28}{n}\\\\=19-\dfrac{28}{7}\\\\=19-4\\\\=15[/tex]
Hence, the expression that has a value of 15 when n = 7 is 19-28/n.
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