Wildlife Biologists studying orcas (killer whales) are following the ocean currents. One of the currents is stalling the orcas. It has a circular rotation and has a radius of 0.25 km. What is the area that particular circle spans?

DIRECTIONS: Use the formula below and show your work with you answer.

A=∏r2

Brainliesttt me asap! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

Adepositional also feature that forms where a stream enters a lake or an ocean is a