Explanation:(a) Was this an observational study or an experiment? Explain your reasoning. Experiment, because certain variables were controlled (he sets the screen brightness to low and then starts a movie) to determine if iPhones last longer if the screen brightness is set to low, and it proves the cause and effect relationship.
(b) What is the explanatory variable and the response variable? Response Variable- To determine if iPhones last longer if the screen brightness is set to low Explanatory variable- he sets the screen brightness of 10 of the iPhones to high and starts a movie, then the other 10 to low and starts a movie.
(c) Was a random sample used to collect the data? Yes- “he selects a random sample of 20 brand new iPhones”
Answer:
y= 155.45 cm
Explanation:
To solve this, we will need to use the Law of Sines
This states that:
Firstly, we need to find the sin of angle y. As this is a 30-60-90 right triangle, we know that the angle must be 60 degrees
Now that we have side x, the angle X, and the angle Y, we can solve for the side y using the Law of Sines
Lets plug in our known values into the equation
Next we can solve for y
When plugged into a calculator, you get the value of 155.45 cm for side y
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