The surface area of a solid metallic sphere is 616 cm2. It is melted and recast into smaller spheres of diameter 7cm. How many such spheres can be obtained?

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

32a³b² 8ab² simplify the following expression.

Jackson earns $25 per hour as a tutor at the college library. he set a weekly spending budget of $130 each week and puts the remaining money in his savings account. how many hours must he work this week to have at least an extra $50 to put in his savings account