En una petita llibreria de segona mà en un dia han venut 21 llibres. Hi ha tres models de llibres: l'A, el B i el C. Un llibre del model A costa 7 euros, un del model B 5 euros i un del model C 12 euros. Sabent que han venut dos llibres més del model C que del B i que del model C han venut 7 llibres, quants diners en total han guanyat en aquest dia?

2

step-by-step explanation:

the area of the rectangle is 35units^2.

step-by-step explanation:

graph it and find the distance.

it is a 5*7 rectangle.

therefore the area is 35units^2.

yes, gavin is right.

step-by-step explanation:

gavin is correct. 

this problem is about converting 9% per year to how many percent per quarter. the rate is still the same. it only differed in the time period. so, through dimensional analysis,

9% per year  × (1 year / 4 quarters) = 2.25% per quarter

if he was asked to convert 9% per year to how many percent per quarter  compounded quarterly, then you will not simply divide by four. this is because compounding is not linear.

hope this , have a good day. c;

english maybe i can ..