7 + (2+ 3) equivalent to (7 + 2) + 3

Aflower has 26 chromosomes. to create a new flower,how many would a sperm cell have what is called?

The mean of 10 values is 19. if further 5 values areincluded the mean becomes 20. what is the meanthese five additional values? a) 10b) 15c) 11d) 22

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)