Answer:
x= 4, 2.5(or 5/2)
Step-by-step explanation:
2x²-3x-15=5
-5 -5
2x²-3x-20=0
plug into quadratic equation
(3+13)/4 (3-13)/4
16/4=4 10/4=2.5
Answer:0.012
Step-by-step explanation:
- 3/10*4/100
- find the product of the numerators 3 and 4 and denominators 10 and 100
- 12/1000
- 0.012
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Answer:a
Step-by-step explanation:
Answer:
Step-by-step explanation:
Answer:
Infinite series equals 4/5
Step-by-step explanation:
Notice that the series can be written as a combination of two geometric series, that can be found independently:
The first one: 
is a geometric sequence of first term (
) "1" and common ratio (r) " 
", so since the common ratio is smaller than one, we can find an answer for the infinite addition of its terms, given by: 
The second one: 
is a geometric sequence of first term "1", and common ratio (r) " 
". Again, since the common ratio is smaller than one, we can find its infinite sum:
now we simply combine the results making sure we do the indicated difference: Infinite total sum= 
