\( \begin{array}{ll}\text { 1. } 5 \times \ldots=-40 & \text { 6.__ } \times(-13)=78 \\ \text { 2. }(-15) \times 17=\ldots & \text { 7. } 7 \times \ldots=-84 \\ \text { 3. } \_ \text {x } \times(-19)=228 & \text { 8. }(-33) \times=(-4)=\ldots \\ \text { 4. }(-9) \times \_=-99 & \text { 9.__ } \times 44=-308 \\ \text { 5.__ } \times 15=165 & \text { 10. }-25 \times \ldots=250\end{array} \)

Suppose we know that the *sum* of the digits of a number is 42. Use appropriate divisibility tests to select all the statements that we know *must* be true. divisible by 5 divisible by 3 divisible by 9 divisible by 2 divisible by 10 divisible by 4 \( > \) Next Question

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

If you applied the divisibility test for 9 to determine whether or not the natural number 33383687 is divisible by 9 , you would check to see if 9 divides what number? \( > \) 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 \( A+B \).

Se você tem 3,75 litros de leite e usa 1,25 litros para fazer um bolo, quantos litros de leite restam?