Could someone answer this. z/7−9=2

solving multi-step equations by combining like terms.

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

Write the equation in logarithmic form e^x=403.429

X+y=-4 x-y=2 use elimination with adding and subtraction