Explain how estimation you to place the decimal point when multiplying 3.9 x 5.3 ?

Brent works part-time at a clothing store. he earns an hourly wage of $15. if he needs to earn more than $45 in a day and works for x hours a day, which inequality represents this situation? a. 15x > 45 b. 15x < 60 c. x > 60 d. 15x < 45 e. x < 60

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

Ammonia molecules have three hydrogen atoms and one nitrogen atom.how many of each atom arein five molecules of ammonia