How many moles are in 8.30×10^23 molecules of h2o?

Find the simple interest earned to the nearest cent for each principal,interest rate,and time 735 7% and two and a half years

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

The sum of the reciprocal of a positive number and the reciprocal of 2 more than the number is 3/4 equation: the number is