15 The square root of the difference of number and 1

\( \frac{8102366\times \sqrt {=3++}}{} \)

Determine whether the graphs of the pair of lines are parallel. \( \begin{array}{l}x+13=y \\ y-x=-9\end{array} \) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The slope of the line \( x+13=y \) is B. The slope of the line \( x+13=y \) is undefined. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. B. The slope of the line \( y-x=-9 \) is B. Are the graphs of the given equations parallel? Yes No

Convert this fraction into decimal form. Round any repeating decimals to two digits (hundredths). \[ \frac{1}{3} \]

Four explorers wish to get one of their number as far as possible into the wilderness from their base. Each explorer can carry supplies for up to 10 days. At any time supplies can be transferred between explorers and individual explorers can return to base, provided they have sufficient supplies for the retum journey. Supplies cannot be left unattended in the wilderness. What is the greatest number of days the lead explorer can travel from the base so that all return safely?

When did the human population first reach 1 billic around 1900 around 1300 around 2000 around 1800