Picklepoppers i need help hurry A physical education class is doing jumping jacks for 60 seconds. How many seconds remain if 18 seconds have passed?

24
42
58
78

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a