<h3>The recursive formula for this geometric sequence is:</h3>
<em><u>Solution:</u></em>
Given that,
-4, -24, -144, -864
To find: recursive formula for geometric sequence
Find the common ratio "r"
<em><u>The nth term of geometric sequence is given as:</u></em>
Where,
n is the nth term
is the first term
r is the common ratio
From sequence,
Therefore,
Where, n = 1, 2, 3, ....
Thus the recursive formula is found
Answer:
16,21,15
Step-by-step explanation:
Answer: A
$19,500 divided by $325 is 60. This means it would take Eric 60 months to save up for college.
You first find the average of the first two test scores. When you find the average, you add the two numbers together and then divide by two which gives you 89. You then plug in different scores above the number 89 and find the average of those (89 and x) to see which gives you an average of 92. It’s mostly a guess and check type of problem.
Answer: the fuel efficiency of the first car is 20 miles per gallon.
the fuel efficiency of the second car is 15 miles per gallon.
Step-by-step explanation:
Let x represent the number of miles per gallon of the first car.
Let y represent the number of miles per gallon of the second car.
During one particular week, the first car consumed 20 gallons of gas and the second consumed 15 gallons of gas. The two cars drove a combined total of 625 miles. It means that
20x + 15y = 625- - - - - - - - - - 1
The sum of their fuel efficiencies was 35 miles per gallon. It means that
x + y = 35
Substituting x = 35 - y into equation 1, it becomes
20(35 - y) + 15y = 625
700 - 20y + 15y = 625
- 20y + 15y = 625 - 700
- 5y = - 75
y = - 75/ - 5
y = 15
x = 35 - y = 35 - 15
x = 20