To how many decimal places are you supposed to 'estimate' the answer to?

Events a and b are independent. the probability of a occurring is 2/5. the probability of b occurring is 1/4. what is p(a and b)?

At a local museum, the total price for one adult and one child is $11. mrs. smith paid for herself and her three children. she spent $19. record the system of equations to be solved and then find the price of an adult and child ticket using either elimination or substitution.

Twice the sum of a number and 2 is equal to three times the difference of the number and 8. find the number.