Factorise the following: i) 42- x -x^2 ii) 16x^2 + 25- 40x

Step-by-step explanation:

$53.50

step-by-step explanation:

you have to subtract the amount of money chuck earned ($72.50) by the cost of the gas for the mower ($11.25) and the new string for the trimmer he bought ($7.75).

72.50-11.25=61.25

and then subtract $61.25 by the second thing he bought (the new string for the trimmer)

61.25-7.75=53.5

so in total it's $53.50 (53 dollars and 50 cents)

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)