A father who is 42 years old has a son and a daughter. The daughter is three times as old as the son. In at present? 10 years, the sum of all their ages will be 100 years. How old are the two siblings

Chen spent 7 hours at school on Friday he spent 30 minutes at lunch 50 minutes at a school assembly and the rest in class how much time did Chen spend in class

Two riders are in a bike race. The second rider starts half an hour late but rides 4 miles per hour faster than the first rider. If they both finish 3 hours after the race starts, how fast are they each riding?

C'est quoi un square root?

What is 7 0 0, 0 0 0 + 9, 0 0 0 + 6 0 + 7 700,000+9,000+60+7700, comma, 000, plus, 9, comma, 000, plus, 60, plus, 7 in standard form?

How do you write this 11,465.2 billion in numbers?

What is the minimum value of P=24x + 30y given the constraints

The cylinder shown has a volume of 54π cm3. In a similar cylinder, the dimensions have been doubled. What is the ratio of the volumes (small to large) ?

A sequence is defined that the first term is 4 and each term after the first term is found by adding 4/5 to the preceding term. What is the 8th term of the sequence?

A scientist is investigating a cell. The cell has a membrane thickness of 7.*10-8 m and has a surface area of 4.*10-8. The initial concentration inside the cell is n (0) = 0.6 M, and the scientist later observes that an (0.2) = 0.77 M.

13[42 - (2+4) second power]