I need help
The problem is whir has expression is equivalent to

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^

i would need to see the dot plot : )

may i see the picture? it would a lot, xox