Cecilia bought 2 sandwiches last week and 4 sandwiches this week. She spent a total of $42. if each sandwich costs the same
much did Cecilia spend on each sandwich? Write and solve equations.

help me i need to do it now or i get a 0

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297

Can someone tell me if this is perpendicular? !