Question 181312
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If you have a proportion of the form:


*[tex \LARGE \frac {a}{b} = \frac {c}{d}]


Then you can cross-multiply, by multiplying the numerator on one side times the denominator on the other side and setting that equal to the numerator on the second side times the denominator on the first side, like this:


*[tex \LARGE a \times d = c \times b]


So for your first problem:


*[tex \LARGE \frac {2}{10} = \frac {16}{x} \ \ \Rightarrow\ \ 2 \times x = 16 \times 10 \ \ \Rightarrow\ \ 2x = 160]


You should be able to take it from here.



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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