Two spherical pieces of cookie dough have radii of 3cm & 5cm. the pieces are combined to form one large spherical piece of dough. what is the approximate radius of the new sphere of dough? round to the nearest tenth

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

If myesha works overtime, she gets paid "time and a half" for every hour she works. in other words, for every hour over 40 hours myesha works each week, she gets her hourly pay plus half her hourly pay. what is myesha's pay per hour when she works overtime?

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.