If you want to solve this problem using formulas, there are two important formulas:
t1 = first term = -5
tn = nth term = last term = -5
n = numbr of terms
Sn = sum of the n terms
tn = t1 + (n - 1)d ---> 65 = -5 + (n - 1)(5)
65 = -5 + 5n - 5
65 = -10 + 5n
75 = 5n
n = 15
Sn = n(t1 + tn)/2 ---> Sn = 15(-5 + 65)/2
Sn = 450
So ur answer rounds up to 450
Letter c
:)
hope i helped
~Luis
Answer:



Step-by-step explanation:
Mass of particles that a river can transport, 
where:
v = velocity of river flow
When 
then the mass transported, 
<u>When mass is twice:</u>
![v=\sqrt[6]{2}](https://tex.z-dn.net/?f=v%3D%5Csqrt%5B6%5D%7B2%7D)

<u>When mass is 10 times:</u>
![v=\sqrt[6]{10}](https://tex.z-dn.net/?f=v%3D%5Csqrt%5B6%5D%7B10%7D)

<u>When mass is 100 times:</u>
![v=\sqrt[6]{100}](https://tex.z-dn.net/?f=v%3D%5Csqrt%5B6%5D%7B100%7D)

Answer:
(-3,5)
Step-by-step explanation:
Please brainleist me
Answer:the distance between the two cities is 100 miles
Step-by-step explanation:
Let x represent the distance between New York and Philadelphia.
Let t represent the time it takes to travel from New York to Philadelphia at 50 mph
Distance speed × time
time = distance/speed
To travel from New York to Philadelphia at 50 mph,
x = 50t
it takes 20 more minutes than to travel the same distance at 60 mph. Converting 20 minutes to hours, it becomes 20/60 = 1/3 hours. This means that
x = 60(t - 1/3) = 60t - 20
Since the distance is the same,
60t - 20 = 50t.
60t - 50t = 20
10t = 20
t = 20/10 = 2
Therefore
x = 50t = 50 × 2 = 100 miles