Write a formula for by writing as

src="https://sciemce.com/media/3/ppg__cognero__Section_5.2_Sum_and_Difference_Formulas__media__ebf678c0-f71f-48a5-a172-9d08da0fc79b.PNG" class="wirisformula" align="middle" style="vertical-align: middle;" data-wiris-created="true" varid="variable_id_field" variablename="impvar_4b1506d72a2c44dd802fa3aa8" /> and using the formula for the cosine of a sum.

What will be an ideal response?

---

Mathematics

Multiply.(2x + 9y)2

A. 2x2 + 36xy + 81y2 B. 4x2 + 81y2 C. 4x2 + 36xy + 81y2 D. 2x2 + 81y2

Use an algebraic approach to solve the problem:Suppose that the width of a certain rectangle is 3 inch more than one-fourth of its length. The perimeter of the rectangle is 26 inches. Find the length and width of the rectangle. 

A. 6 inches wide, 7 inches long B. 3 inches wide, 10 inches long C. 4 inches wide, 9 inches long D. 5 inches wide, 8 inches long E. 8 inches wide, 5 inches long

Solve.The nutrition label on a bag of candy says that a serving size is 61 grams. How many ounces are in a serving? Round your answer to the nearest hundredth if necessary.

A. 2.15 oz B. 27.69 oz C. 134.2 oz D. 1729.35 oz

Let X be a continuous random variable with a cumulative distribution function . Find 

A. e-1 - e-2 B. 1 - e-1 - e-2 C. e-1 - e-4 D. e-1 - e-2 - 2 E. none of these