Adam is going to make concrete. He is going to use:
180 kg of cement
375 kg of sand
1090 kg of stone

Cement, sand and stone are sold in bags:
1 bag cement 25 kg
1 bag sand 22.5 kg
1 bag stone 50 kg

Adam already has:
8 bags of cement
19 bags of sand
20 bags of stone

Work out what bags he needs to buy to make the concrete.
Working must be shown please.

Is there a direction u in which the rate of change of f(x,y)equals=x squared minus 3 xy plus 4 y squaredx2−3xy+4y2 at p(1,2) equals 14? give reasons for your answer. choose the correct answer below. a. no. the given rate of change is smaller than the minimum rate of change. b. no. the given rate of change is larger than the maximum rate of change. c. yes. the given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change.