hi yaz!

4) 30coins = quarters + dimes

we are given that: quarters > $5.20

one quarter is .25, so 20 quarters is: 20(.25) = $5. however, 20 quarters < $5.20, so we must have an additional quarter to make that statement true giving us a total of 21 quarters. knowing this, we can now solve for dimes:

30 = 21 + dimes

30 - 21 = dimes

9 = dimes

8) let n be the small integer

let (n+1) be the consequitive larger integer

we are given:

5n < 4(n+1)

solving for n:

5n - 4n < 4

n < 4

11)

A = $4(maintenance fee) + .10(check cashed)

B = $6(maintenance fee) + .06(check cashed)

so we wanna find out when is A > B:

$4 + .10x > $6 + .06x solve for x

4 - 6 > .06x - .10x

-2 > -(1/25)x

-2(-25) < x

50 < x