Evan has a shell collection. on monday he found 6 new shells. on tuesday , he gave 9 shells to his friends. after giving the shells away, evan had 37 shells left. how many shells did evan have to begin with?

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step-by-step explanation:

answer: the first one

step-by-step explanation: use a calculator and divide the minutes by the dollars.

center (1,3) with radius 6

step-by-step explanation:

we must complete the square to find the center and radius of the circle.

first make sure the x and y squared terms have 1 as their coefficients. we also make sure x and y terms together.

we now create space between the x and y terms with parenthesis.

we complete the square by taking the middle terms -2x and the -6y - divide each and square them.

we add the squares to both sides.

simplify.

and write the quadratics in factored form.

the center is (h,k) or (1,3). the radius is the square root of 36 which is 6.