How would i solve this? w+4/w-9? how do i find the values for this?

Segment xy is dilated through point m with a scale factor of 2. which segment shows the correct result of the dilation

The following division is being performed using multiplication by the reciprocal find the missing numbers is 5/12 divided by x/3 equals 5/12 times x/10 equals 1/x

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of