Answer:
4 and 6.
Step-by-step explanation:
There are 4 different grades represented, so for the first question, there are 4 ways that the students can sit if they must sit together by grade.
For the second question, there are 3 grades other than senior level, so it starts with 3 ways that the students can be seated. 3 ways x 2 students per way = 6 ways
1.
a. 8 x 7 x 1/2 = 56 x 1/2 = 28
b. 24 x 14 x 1/2 = 336 x 1/2 = 168
c. 5 x 12 x 1/2 = 60 x 1/2 = 30
d. 4 x 4.8 x 1/2 = 19.2 x 1/2 = 9.6
2.
two triangles: 2(4 x 8 x 1/2) = 4 x 8 = 32
rectangle: 15 x 8 = 120
total area: 32 + 120 = 152
6/15 + 10/15 = 16/15 = 1 1/15
6/15 - 10/15 = -4/15
just fyi, if you spend x points on question, each user gets x/2 points (rounded up or down, I don't remember)
simple interest formula is
I=PRT
I=interest
P=principal
R=rate in decimal
T=time in years
assuming you mean that the principal is $2500 and not 2500 cents or 2500 of some other currency
interest=500
R=4%=0.04
I=PRT
500=(2500)(0.04)(T)
500=100T
divide both sides by 100
5=T
answer is 5 years
C is answer
