Sum of polynomials?

(m+n+3) + (m+n+4)

A.-1

B. m2+n2+7

C. 2m+2n+7

D. 2m2+2n2+7

Suppose there are 15 people in a room. each of those 15 shakes hands exactly once with everyone else. how many handshakes take place?

What is the relationship a - b and b - a

Angle a measures 50 degrees, if angle a is rotated 45 degrees, what is the measurement of angle a

A certain magical substance that is used to make solid magical spheres costs $700 per cubic foot. The power of a magical sphere depends on its surface area, and a magical sphere can be sold for $50 per square foot of surface area.

find the mean, range, and median of these values 12,4,-2,0,9.-2,1,7,8,2 recall the range is calculated by finding the difference between the largest and smallest data values. hurry

If Lorie can bike an average speed of 6 miles per hour, how far will she travel in 15 minutes?

If i was born in 2005 how old would i be in 2014

What is (5479) * (3245)

At a benefit concert, eleven bands have volunteered to perform but there is only enough time for six of the bands to play. How many lineups are possible?

Ed has 150 marbles. How many bags of 10 marbles does he need to get so that he will have 200 marbles in all?