61,069,054 rounded to the nearest ten million

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

Apatient is to take 60 mg of an antibiotic on day 1, take 45mg on days 2 and 3, take 30mg on days 4 and 5 and take 15 mg on days 6 and 7. how many total mg will the patient take?

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?