Answer:
The common difference of the progression is 3.
Step-by-step explanation:
Given:
First term of the AP = (a) = -8
Ratio of 7th and 9th term = 5:8
So,
General term of an AP, Tn= a+(n-1)d
Where 'd' is the common difference.
equation...(i)
equation...(ii)
According to the question.
⇒ 
...cross-multiplying the terms.
⇒ 
⇒ 
⇒ 
...subtracting 40d and adding 64 both sides.
⇒ 
⇒ 
...dividing both sides with 3.
So the common difference of the progression is 'd' = 3.
Hello from MrBillDoesMath!
Answer:
80,100 (which is NONE of the provided answers)
Discussion:
-225 * -356 =
+ (225 * 356) = as the product of two negative numbers is positive
80,100
Regards,
MrB
P.S. I'll be on vacation from Friday, Dec 22 to Jan 2, 2019. Have a Great New Year!
5*3 = 15
The product of 5 and 3 is 15.
Area of the cone = 1/3 π r² h
12= 1/3 π (1.5)² h
36 = 2.25 π h
h = 36 ÷ 2.25π
h = 5 in
Answer: Height = 5 inches
