It would be 6x5 squared-5x4+8
150-20+8=138
The exponential equation that represents how many grams of the compound will remain after 8 hours is:
B: C=260(0.962)^8
<h3>What is an exponential function?</h3>
A decaying exponential function is modeled by:

In which:
- A(0) is the initial value.
- r is the decay rate, as a decimal.
A radioactive compound with mass of 260 grams decays at a rate of 3.8% per hour, hence the equation for the mass after t hours is given by:


After 8 hours, the amount is given by:

Hence option B is correct.
More can be learned about exponential equations at brainly.com/question/25537936
Answer:
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Step-by-step explanation:
Answer:
The measure of the fourth angle is 90°.
Step-by-step explanation:
Let x be the measure of the fourth angle.
Given measures of the other angles : 50°,120° & 100°.
<u>Knowledge Required </u>:
The sum of all the interior angles of a quadrilateral is 360°.
Then,
50°+120°+100°+x=360°
⇒x = 360°-270°
⇒x = 90°
.°. x = 90°
Hence, the measure of the fourth angle is 90°.
Using the z-distribution, it is found that the 95% confidence interval is of -1.38 to 1.38, and 1.74 is outside the interval.
<h3>What is a confidence interval for the difference in sample means?</h3>
It is given by:

In which:
is the estimate of the difference.
In this problem, we have a 95% confidence level, hence
, z is the value of Z that has a p-value of
, so the critical value is z = 1.96.
The estimate and the standard error are given, respectively, by:

Hence, the interval has the bounds given as follows:


The 95% confidence interval is of -1.38 to 1.38, and 1.74 is outside the interval.
More can be learned about the z-distribution at brainly.com/question/24372153
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