During a trip, a driver travelled a distance of 80km at an average speed of 60km/hr. He then changed his speed and travelled the remaining 20km of his journey at 30km/hr. What was the drivers average speed for the entire journey? Show all working!!​

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?

Acircle has a circumference of 28.36 units what is the diameter of the circle

The edge of a cube was found to be 30 cm with a possible error in measurement of 0.4 cm. use differentials to estimate the maximum possible error, relative error, and percentage error in computing the volume of the cube and the surface area of the cube. (round your answers to four decimal places.) (a) the volume of the cube maximum possible error cm3 relative error percentage error % (b) the surface area of the cube maximum possible error cm2 relative error percentage error %