Elena is making greeting cards, which she will sell by the box at an arts fair. She paid $54 for a booth at the fair, and the materials for each box of cards cost $9.50. She will sell the cards

for $11 per box.

At some point, she will sell enough cards so that her sales cover her expenses. How much will

the sales and expenses be? How many boxes of cards will that take?

Elena's sales and expenses will both be $

if she sells

boxes of cards.

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David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?

On ryan's last social studies test there were two types of questions true/false worth 3 points each and multiple choice questions worth 4 points each

Aresearch study is studying the effects of a new drug for osteoporosis alzheimer's disease (ad) for women above the age of 65 years. a group of individuals with osteoporosis is randomized into two groups. one group is treated conventionally, and the second group is treated with the new medication. assessments are made at 3, 6, 12, 36, and 48 months. the conventionally treated group is assessed for ad using a serum blood test, and the treatment group is assessed for ad using a pet radiotracer that binds to beta-amyloid plaques. in comparing these 2 trial arms, the authors of the study may encounter which type of bias? a. selection bias on the risk of developing b. measurement bias c. confounding bias d. recall bias e. lead-time bias