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Sam uses 140g of flour to make 12 cakes. How much flour will Sam need to make 21 cakes?

140 / 12 = 11.666^.

11.66^. * 21 = 245

Answered by Charlie N. • Maths tutor

3247 Views

A sample of hydrochloric acid has a pH of 2.34.  Write an expression for pH and calculate the concentration of this acid.

pH = -log([H+])

Therefore, 10^(-pH) = [H+]

[H+] = 4.57x10^-3

Answered by Charlie N. • Chemistry tutor

10351 Views

Explain the flow of ions during an action potential of a typical neurone

There are numerous ionic fluxes during an action potential, which involves depolarisation, repolarisation and hyperpolarsation. During depolarisation, voltage-gated sodium ion channels open. In turn, sodi...

Answered by Annie S. • Biology tutor

4120 Views

Question: What proportion of the clock is the area covered when the time is 12:10? (Here the question should indicate the time stated and shade in the proportion of the clock to be computed.)

The key to answering this question is for the student to realise that even though the area to be computed is a difficlut shape (an arc), the clock consists of 5 more arcs of the same shape. Once the stude...

Answered by Annita V. • Maths tutor

3095 Views

Work out the value of 2a^2 + b^3 when a = 5 and b = –3

To work out the values you need to sub in a and b into the equation, giving you: 2(5)² + (-3)³ From this we use the rules of BODMAS to first complete the orders and obtain: 2*25 + (-...

Answered by Kyle M. • Maths tutor

5002 Views