Asphere has a diameter of 7 centimeters. what is the surface area? use 3.14 to approximate pi. round to the nearest hundredth if necessary

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

To convert celsius temperatures to fahrenheit, you can use the expression (c + 32). tom says that another way to write this expression is c + 32. what error did tom make?