9. The points P, Q and R are collinear. It is given that PQ = 4a - 2b and QR = 3a +(1+k)b,
where k is a constant.
Find
(a) the value of k.
(b) the ratio of PQ: OR.

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!

3x + 4y -25 =0 represents the amount of change sianna should recieve

i dont know

step-by-step explanation:

umm. i dont know

c. 1,233 miles