(10x+5) + (6x-1)=180
10x+5+6x-1=180
16x+4=180
16x+4=180
16x=180-4
16x=178
x=11
Answer:
In order for an equation to have an infinite number of answers,
the simplified equation should be x=x.
In evaluating the above equation, -3 inserted in the box results in this simplified equation.
The answer is therefore -3
1 2/5 x 3 4/5 = 5.32 -- with calculator
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You can change mixed fractions to improper fractions.
1 2/5 = 1 x 5 + 2 = 7 = 7/5
3 4/5 = 3 x 5 + 4 = 19 = 19/5
7/5 x 19/5 = 133/25 = 5.32
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To make sure you can then turn the improper fractions to decimals.
7/5 = 1.4
19/5 = 3.8
1.4 x 3.8 = 5.32
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Whenever I get mixed fraction questions, I always check it in these different excess ways just to make sure :3 Hope it helped..