Solve the problem.The area of a circle is found by the equation A = ?r2. If the area A of a certain circle is 4? square centimeters, find its radius r.
A. r = 2? cm
B. r = ± 2 cm
C. r = 2 cm
D. r = 2
cm
Answer: C
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Provide an appropriate response. Graph the absolute-value equation y = |x|.
A. 
B. 
C. 
D. 
Solve the problem.Marty's Tee Shirt & Jacket Company is to produce a new line of jackets with an embroidery of a Great Pyrenees dog on the front. There are fixed costs of $660 to set up for production, and variable costs of $40 per jacket. Write an equation that can be used to determine the total cost, C, encountered by Marty's Company in producing x jackets.
A. C = (660 + 40) x B. C = 660x + 40 C. C = 660 - 40x D. C = 660 + 40x
Solve.Three trains - one eastbound, one westbound, and one northbound - leave a city at the same time. The speed of the northbound train is 10 miles per hour greater than the speed of the eastbound train. After 8 hours, the distance between the westbound train and the eastbound train is 1040 miles. Twice the speed of the westbound train is 70 miles per hour more than the speed of the northbound train. Find the speeds of the three trains.
A. eastbound, 70 mph; westbound, 70 mph; northbound, 80 mph B. eastbound, 50 mph; westbound, 80 mph; northbound, 70 mph C. eastbound, 60 mph; westbound, 70 mph; northbound, 70 mph D. eastbound, 70 mph; westbound, 70 mph; northbound, 60 mph
Write a formula for src="https://sciemce.com/media/3/ppg__cognero__Section_5.2_Sum_and_Difference_Formulas__media__7dcfbdfe-0b1a-49cf-8a8c-9acba85daf1c.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 sine of a sum.
What will be an ideal response?
by writing 
as