Melissa is 9 years old. How old will she be in x years?

Mathematics

2 answers:

solniwko [45]3 years ago

6 0

Answer:

Taking that you didn't provide any other information about the values of x..

The only plausible answer, which probably isn't your case but still can be valid out of context is 19.

Step-by-step explanation:

"X" is 10 in Roman numbers.

9 + 10 = 19

(But I suppose that you had more details to the question that you didn't yet share :) )

OR.. the answer might be an algebraic expression..

<u><em>"9+x" years old.</em></u>

bezimeni [28]3 years ago

5 0

If you’re posing this question as x being a variable, then your answer would be any number times 9.

Ex:

9 + 3 = 12 yrs old

9 + 10 = 19 yrs old

9 + 2 = 11 yrs old

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Two certificates of deposit pay interest that differ by 3%. Money invested for one year in the first CD earns $240 interest. The

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a = interest rate of first CD

b = interest rate of second CD

and again, let's say the principal invested in each is $X.

$\bf a-b=3\qquad \implies \qquad \boxed{b}=3+a~\hfill \begin{cases} \left( \frac{a}{100} \right)X=240\\\\ \left( \frac{b}{100} \right)X=360 \end{cases} \\\\[-0.35em] ~\dotfill\\\\ \left( \cfrac{a}{100} \right)X=240\implies X=\cfrac{240}{~~\frac{a}{100}~~}\implies X=\cfrac{24000}{a} \\\\\\ \left( \cfrac{b}{100} \right)X=360\implies X=\cfrac{360}{~~\frac{b}{100}~~}\implies X=\cfrac{36000}{b} \\\\[-0.35em] ~\dotfill\\\\$

$\bf X=X\qquad thus\qquad \implies \cfrac{24000}{a}=\cfrac{36000}{b}\implies \cfrac{24000}{a}=\cfrac{36000}{\boxed{3+a}} \\\\\\ (3+a)24000=36000a\implies \cfrac{3+a}{a}=\cfrac{36000}{24000}\implies \cfrac{3-a}{a}=\cfrac{3}{2} \\\\\\ 6-2a=3a\implies 6=5a\implies \cfrac{6}{5}=a\implies 1\frac{1}{5}=a\implies \blacktriangleright 1.2 = x\blacktriangleleft$

$\bf \stackrel{\textit{since we know that}}{b=3+a}\implies b=3+\cfrac{6}{5}\implies b=\cfrac{21}{5}\implies b=4\frac{1}{5}\implies \blacktriangleright b=4.2 \blacktriangleleft$