Evaluate each expression. (-2/9 -1/4) - {-5/18 - (-1/2)}

Add or subtract as indicated. 28.73 - 3.12

Perform the indicated computations. Write the answers in scientific notation. If necessary, round the decimal factor in your scientific notation answer to two decimal places. $(8.4\times {10}^8)/(4\times {10}^5)$

Add or subtract as indicated. 46.88 - 13.45

Let U = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13}, M = {0, 2, 4, 6, 8}, N = {1, 3, 5, 7, 9, 11, 13}, Q = {0, 2, 4, 6, 8, 10, 12}, and R = {0, 1, 2, 3, 4}.Use these sets to find each of the following. Identify any disjoint sets. (M ∩ N) ∪ R

Evaluate each expression. $\(\frac{15 \div 5 \cdot 4 \div 6 - 8}{-6 - (-5) - 8 \div 2}\)$

Add or subtract as indicated. 345.1 - 56.31