Li and Jen went shopping. • Li bought 5 pairs of earrings and 1 necklace for a total of $56.
• Jen bought 1 pair of earrings and 2 necklaces for a total of $40.

Each pair of earrings cost e dollars and each necklace cost n dollars. Which system of equations can be used to find the cost, in dollars, of each pair of earrings and each necklace?
A.
5e + 2n = $56
e + n = $40

B.
5e + n = $56
e + 2n = $40

C.
e + 5n = $56
e + 2n = $40

D.
5e + n = $56
2e + n = $40

1. are the triangles similar and if so why? what is the value of x? show your work.

Zahra runs a 500-meter race at a constant speed. which graph shows her distance from the finish line during the race?

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