A library has been given a specific amount of money and can buy 350 hardback books costing £15.75 each
a How many books costing £10.50 could be bought instead?
b What type of proportion does this represent

525 books

Step-by-step explanation:

Total books = 350

Cost of each book = £15.75

Total cost = 350 × £15.75

= £5,512.5

a. How many books costing £10.50 could be bought instead?

Instead of using £5,512.5 to buy 350 books at £15.75 each,

Number of books = total cost / cost per book

= £5,512.5 / £10.50

= 525 books

£5,512.5 can be used to buy 525 books at £10.50 each

The proportion is a direct proportion

linearly: 8560 bacteria

exponentially: approximately 75233 bacteria

step-by-step explanation:

assuming it is not exponential (we would have some really complicated logarithms), let's say it is linear. then, after 5 hours, it increased by 1200 bacteria, so every hour it increases by 240 bacteria. this means that after 19 hours, we get 19 * 240 + 4000 bacteria or 3800 + 760 + 4000 = 7800 + 760 = 8560 bacteria.

because it says round your answer, i will do this exponentially (with a calculator, of course). first, we need to find how much it multiplies by every hour, by taking the 5th root of 52/40 or 13/10. this is approximately 0.167. we still need to add 1 to this, because we are multiplying by that number, not adding that amount of the number. now, we just calculate 4000 * (1.167)^19. use a calculator to get approximately 75232.6, or 75233.

idk i would have to be there to under stand it

step-by-step explanation:

idk i would have to be there to under stand it