A family took 3 hours to complete the 210 km from their home to their holiday house a) Find their average speed for the trip.
b) If they increased their average speed to 90 km/h, how many hours and minutes
would the trip have taken?​

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?