Mathematics: Evaluate the expression when a=2/3 and c= -2/7 -4c-a Write your answer in simplest form.

Evaluate the expression when a=2/3 and c= -2/7 -4c-a

BreBreDoeCCx

10.10.2021

$\frac{10}{21}$

Step-by-step explanation:

Substitute the given values into the expression

- 4c - a

= - 4 × - $\frac{2}{7}$ - $\frac{2}{3}$

= $\frac{8}{7}$ - $\frac{2}{3}$ ( the LCM of 7 and 3 is 21 ) , then

= $\frac{8(3)}{7(3)}$ - $\frac{2(7)}{3(7)}$

= $\frac{24}{21}$ - $\frac{14}{21}$

= $\frac{24-14}{21}$

= $\frac{10}{21}$

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Okaytashy

14.06.2022

At least 5 days

Step-by-step explanation:

400 miles per day / 1990 miles trip would take?

Cross multiplying gives;

$\frac{1990}{400}$ = 4.975 days

Rounding off the answer to nearest day gives 5 days.

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