11) Soluciona la siguiente operación de racionales: \[ \frac{-4}{3}+\frac{5}{7}= \] \( \begin{array}{llll}\text { a. }-\frac{13}{21} & \text { b. } \frac{9}{10} & \text { c. }-\frac{1}{4} & \text { d. }-\frac{33}{21}\end{array} \)

Solve this problem, and identify the percent, amount, and base. What percent of 60 is 15 ?

If you applied the divisibility test for 8 to determine whether or not the natural number 437739462455 is divisible by 8 , you would check to see if 8 divides what number? \( > \) Next Question

Find the LCM of this set of numbers 27 and 45

Suppose we know that the last two digits of a number are 50. Use appropriate divisibility tests to select all the statements that we know *must* be true. divisible by 4 divisible by 9 divisible by 5 divisible by 3 divisible by 10 divisible by 2 \( > \) Next Question

\( A=\left[\begin{array}{ccc}1 & 3 & 5 \\ 5 & -1 & 1 \\ 3 & 0 & -2\end{array}\right] \quad B=\left[\begin{array}{ccc}3 & -5 & 2 \\ 3 & 4 & 0 \\ 2 & 1 & -3\end{array}\right] \quad C=\left[\begin{array}{ccc}2.1 & -4 & 1.5 \\ -3 & 5 & 0.3 \\ 5.4 & 2 & -2.8\end{array}\right] \) Find the value in row 2 columin 1 of \( A+B \).