Answer:
I'm sure it is 180 degrees
3/10=4/x
3x=10(4)
3x=40
x=13.33
"the product of" ⇒ ___ * ___
86 ⇒ 86 . . . . . fills first blank
and
the depth of the river ⇒ d . . . . . fills second blank.
Your expression is
86 * d
If dimensions are multiplied by 3 then area is multiplied by 3^2
12 and 1 half were eaten. sorry if im wrong.