Answer:
8/15
Step-by-step explanation:
Pitch = rise/half-span = (8 ft)/(1/2×30 ft) = (8 ft)/(15 ft) = 8/15
<span>-1.1x+ 6.4> -1.3
</span><span>-1.1x > -7.7
x <7
answer
x is less than 7
</span>
The exponential growth is: 
And its graph is the first one.
The exponential decay is: 
And its graph is the second one.
<h3>
How to identify the exponential equations?</h3>
The general exponential equation is of the form:

Where A is the initial value and b is the base.
- If b > 1, then we have an exponential growth.
- if 1 > b > 0, then we have an exponential decay.
Here the two functions are:


As you can see, the base for the first one is smaller than 1, then it is an exponential decay (and it has a decreasing graph, so the graph of this one is the second graph).
For the second function, we have the base b = 1.25, which is larger than 1, so it is an exponential growth, and its graph is an increasing graph, which is the first one.
If you want to learn more about exponential functions:
brainly.com/question/11464095
#SPJ1
Answer:
x = amount of pure acid to be added = 6.67ml
Step-by-step explanation:
George wishes to increase the percent of acid in 50ml of a 15% acid solution in water to 25% acid, how much pure acid must you add?
let
x = amount of pure acid to be added
15% of 50 + x = 25% of 50 + x
(0.15 * 50) + x = 0.25(50 + x)
7.5 + x = 12.5 + 0.25x
Collect like terms
x - 0.25x = 12.5 - 7.5
0.75x = 5
x = 5/0.75
x = 6.6666666666666
Approximately,
x = 6.67
x = amount of pure acid to be added = 6.67ml