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x^x=e^x*ln(x)

So  d/dx (x^x) = d/dx (e^x*ln(x))

By chain rule, we get     d/dx (xln(x))e^xln(x) 

Then by product rule we get...

Distance = 4 x 85 = 340km

Average speed = 340 / 5 = 68 km/h

So this question wants you to rearrange the formula so that b is on its own on one side of the equals sign. As its a formula and not asking for the value of the equation you don't have to worry about solv...

You can use the price of each pack and divide it by the number of bags of crips to get the price per packet, the one with the lowest price per packet will be the best value for money.

The small pac...

Draw the sine graph on a whiteboard. Infer graphically by drawing the line y = a. As 0