21 9. Simplify where possible:
a) 3a -4a +6a
b) 7y + 11y - 18y
c) 4x + 9y -5x - 10y
d) -2m + 3n-9m -4n​

I have calculated a b c d.I hope you wanted me to simplify it like that.that's the only method I know hope it helps.

it shoild be o

step-by-step explanation:

$655.61 which is option c

step-by-step explanation:

price of house =   $146,000

initial rate = 3.5%

mortgaged paid in this = 3.5 % of $146,000

                                        =

                                        =$5110

the total years would be = 7

total mortgaged paid = 7 * $5110

                                      =$35770

remaining money = $146000-35770

                                =$110230

new mortgaged payment = 5 % of 110230

                                            =  

                                            =$655.61