Answer:
C) 182.5
Step-by-step explanation:
i just took the test
Let's call the younger student's age A and the older student's age B. The teacher's age will be T.
B = 2A
T = 5B
T+5 = 5(A+5)
Simplify the last equation.
T+5 = 5A+25
T = 5A+20
Now we have two equations solved for T, so we can set them equal to each other.
5B = 5A + 20
We can plug 2A in for B
5(2A) = 5A + 20
10A = 5A + 20
5A = 20
A = 4
To find T, we plug 4 in for A in T = 5A + 20
T = 5(4) + 20
T = 40
The answer is 40 years old.
Answer:
GE = 3 cm
Step-by-step explanation:
BE = 9 cm
Since G is the centroid, therefore:
=> Centroid theorem
Plug in the value

GE = 3 cm
Answer:
95:95:19
Step-by-step explanation:
1.Divide 209 by 11.(209÷19)
2.Multiply 19×5 since 5/11 of the coins are nickels.(19×5=95)
3.Multiply 19×5 again since 5/11 of the coins are dimes.(19×5=95)
4.Multiply 19×1 since there would be 1/11 left of the coins which are quarters. (19×1=19)
5.Check your awnser by adding 95+95+19.(95+95+19=209)
The length of a light wave is 3.7 x 10^-6 in scientific notation