What is the surface area of the regular pyramid below

According to research, exposure to a certain type of bacteria called mycobacterium vaccae which is found in soil can help increase serotonin levels in the body. Serotonin is a chemical found in the brain. It can boost a person's mood and decrease anxiety. This same chemical can help people better process information in their brains. Just by being outside, our bodies can breathe in this bacteria. Research has shown that this bacteria appeared to boost the mood in laboratory mice. Additionally, the mice that were given this bacteria in their diet were able to move through a maze twice as quickly as mice that were not given this bacteria. These same mice also behaved less anxiously than the other mice.

1

Based on information from the passage, the reader can tell that

A.  

serotonin in a person's body can help improve that person's ability to learn.

B.  

people who have less exposure to mycobacterium vaccae are often smarter.

C.  

many nutritional companies will start placing mycobacterium vaccae in food.

D.  

the laboratory tests on mice do not impact the effect of the bacteria on humans.

Step-by-step explanation:

2 times 14 times 3

Step-by-step explanation:

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.