Answer:
7th graders- 100 students
8th graders- 110 students
Step-by-step explanation:
Let the number of 8th graders be represented by x and 7th graders be represented by y
<u>Equation based on number</u>
There difference between 8th and 7th graders is 10 hence equation becomes
x-y=10
<u>Equation based on contribution</u>
While x contribute each $8 and y contribute each $5, the total contribution is $1380 hence the equation becomes
8x+5y=1380
<u>Combining equations</u>
Having the two simultaneous equations which are
x-y=10
8x+5y=1380
Solving the equations.
5x-5y=50
8x+5y=1380
------------------
13x=1430
x=1430/13=110
Therefore, 8th graders are 110. Since the 8th graders were 10 more than 7th graders, the 7th graders will be 110-10=100 students
If it's 10.75 for one month, and there are 66 months in 5 and a half years, 10.75 x 66 = $907.50
Answer:
y=15x+5
Step-by-step explanation:
Answer:
24.5m
Step-by-step explanation:
given h is proportional to v² or
h ∝ v²
we can write this in terms of constant k
h = kv²
given h = 8 when v = 20
h = kv²
8 = k 20²
8 = 400k
k = 8/400 = 0.02
hence our equation becomes
h = 0.02v²
when v = 35
h = 0.02 (35²)
h = 24.5 meters
Answer:
Step-by-step explanation:
We need to perform the folowing operation:
× 
Factorizing we have:
× 
Simplifying, we get:
