Matt is trying to round 41.449 to 1 decimal place. a) Write a sentence to explain what he has done wrong. b) What is 41.449 rounded to 1 decimal place? \( \begin{aligned} 41.449 & =41.45 \text { to } 2 \text { d.p. } \\ & =41.5 \text { to } 1 \text { d.p. }\end{aligned} \)

34. \( 5-5^{2}+(2-4)= \) 35. \( (8-10) \times(5+3)-10= \) 36. \( \frac{10+5^{2}-3}{2^{2}+2(5-3)}= \)

Change to a percent \( 2 \frac{10}{11} \) :

2. Sea \( a \in Z^{+} \)tal que \( (a, 6)=2 \); si se divide \( a \) por 6 , ¿Cuáles son los posibles valores para el residuo?

Evaluate \( \frac{\left(6 \times 10^{-6}\right)\left(3 \times 10^{9}\right)}{\left(2 \times 10^{-10}\right)\left(4 \times 10^{-5}\right)} \). Write the result in scientific notation. a) \( 225 \times 10^{18} \)

What is the value of \( \sqrt{729}-\sqrt{7.29} \) ? \( \begin{array}{llll}\text { A. } 2.7 & \text { B. } 24.7 & \text { C. } 24.3 & \text { D. } 29.7\end{array} \)