You decide you will buy a stock only if it shows an overall increase over the next 30 days in the first 10 days the stock you chose has an increase of $0.30 per day the next 10 days it has a decrease of $0.45 per day the last 10 days it has an increase of $0.25 per day what was the total amount the stock increase over the first 10 days

We are given:

During the first 10 days, the stock increases by $0.30 per day.

During the next 10 days, the stock decreases by $0.45 per day.

During the last 10 days, the stock increases by $0.25 per day.

We have to find total amount the stock increase over the first 10 days.

The total amount the stock increase over the first 10 days is:

Therefore, during the first 10 days the stock was increased by $3.

3. parallelogram

step-by-step explanation:

we turn each of our sides into direction vectors

ab=b-a=(3 - 7, 1 - 0) = (-4, 1)

bc=c-b=(1,6)

cd=d-c=(4,-1)

da=a-d=(-1,-6)

we see how the opposite sides have negated direction vectors; this is characteristic of a parallelogram.   we have congruent sides ab=cd and bc=da with unequal lengths because 1^2+6^2 is different from (-4)^2+1^2.   so it's not a square or a rhombus.  

we check the dot product of direction vectors of adjacent sides.   we have

ab dot bc = -4(1) + 1(6) = 2

that's not zero so the sides are not perpendicular.   we've ruled out rectangle.

the direction vectors indicate two pairs of congruent parallel sides, so we choose parallelogram over trapezoid.