Subtract the quantity 10x + 5y - 4z from the sum of the quantities 7z + 3y - 10x and 9x - 12y - z

11x + 14y - 10z

Step-by-step explanation:

firstly deal with sum part and then subtract,making sure that you add and subtract values with the same unknowns

(7z + 3y - 10x) + (9x - 12y - z)

then

(10x + 5y - 4z) - (6z - 9y - x)10

11x + 14y - 10z

Step-by-step explanation:

firstly deal with sum part and then subtract, making sure that you add and subtract values with the same unknowns

(7z + 3y - 10x) + (9x - 12y - z)

then

(10x + 5y - 4z) - (6z - 9y - x) 10

Step-by-step explanation:

Hope it helps

check the picture below.

she will sew have sewn five dresses   and be 1/3 done with the sixth one in an hour.

step-by-step explanation:

3/4 of an hour=45 mins

lucy makes 1 dress per 11.25 minutes

45 mins+11.25 mins=56.25 mins

60 mins- 56.25 mins=3.75 mins

3.75 mins is 1/3 of of 11.25 mins

therefore she the other 1/3 would be part of the hour and she will have sewn 5 dresses and begun the sixth.

contact me if you have any questions you are welcome.