45 square centimeters
The area of the triangle is given by ...
A = (1/2)bh
where b is the base, 2 cm + 3 cm = 5 cm, and h is the height, 6 cm.
A = (1/2)(5 cm)(6 cm) = 15 cm^2
The area of the rectangle is given by ...
A = bh
where b is the base, 12 cm, and h is the height, 2.5 cm.
A = (12 cm)(2.5 cm) = 30 cm^2
The area of the whole figure is the area of the triangle added to the area of the rectangle:
drawing area = 15 cm^2 + 30 cm^2 = 45 cm^2
The margin of error is
From the question we are told that
The sample size is
The standard deviation is
The confidence level is %
Generally the level of significance is mathematically evaluated as
The critical value of obtained from the normal distribution table is
The reason obtaining the critical value of instead of is because we are considering the two tails of the area normal distribution curve which is not inside the 99% confidence interval
Now the margin of error is evaluated as
Answer:3(3x+7) -22 I'm pretty sure it's is 9x-1