28. Calculate the perimeter of the rectangle in problem 27 (8) 29. Rename \( \frac{2}{5} \) so the denominator of the renamed fraction is 10 . Then subtract the renamed fraction from \( \frac{9}{10} \) Remember to reduce the answer. 30. When we mentally multiply 15 by 10 , we may think of (46) attaching a zero to 15 to make the product 150 . When we multiply 1.5 by 10 , why can't we attach a zero to make the product 1.50 ?

(ii) \( \begin{array}{r}5.129 \times(-0.15) \\ .23 \\ 5.129 \times 6\end{array} \)

stion 1 ie has \( 35 \frac{3}{4} \) yards of red ribbon and \( 30 \frac{1}{3} \) yards of green ribbon. She cuts the red ribbon into strips tha yards long and the green ribbon into strips that are each \( 2 \frac{1}{6} \) yards long. How many more green strips ps does she have?

4.Представьте произведе \( \left(4,6 \cdot 10^{4}\right) \cdot\left(2,5 \cdot 10^{-5}\right) \)

8. A gym membership costs \( \$ 20 \) per month plus a one-time regstration fee. If you poid a total of \( \$ 180 \) after 6 months, how much was the regstration fee?

10) A loaded truck travels 14 km in \( 25 \mathrm{minutes} \). If the speed remains the same, how far can it travel in 5 hours?