Answer for 15 !

translate the phrase into a variable expression. use the letter d to name the variable. if necessary, use the asterisk ( * ) for multiplication and the slash ( / ) for the division.
product of 86 and the depth of the

The variable expression is given by:

                    86*d

Step-by-step explanation:

We are asked to convert the given phrase into a variable expression.

We are asked to use the letter "d" to denote the variable and "*" sign is used in place of the product or multiplication.

The phrase is:

   ...The product of 86 and the depth of the river...

Let d denote the depth of the river.

Hence, the conversion of the given expression into the  variable form we have:    

                     86*d

dude   i don't even know. i've been trying for hours.

step-by-step explanation:

given that triangle abc is transformed two times to get triangle

a"b"c"

first abc is transformed in to a'b'c' as follows:

the coordinates of a are (1,-1) and transformed into a'(-1,1)

similarly b (4,-2) became b'(-4,2) and

c(7,-2) became c'(-7,2)

i.e. (x,y) becomes (-x,-y)

this is nothing but reflection about a point here origin.

thus first transformation is reflection on the origin.

next is exactly shifting 3 units down

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