Find the product using the formula for multiplying the sum and difference of two terms. Check the answer using the FOIL method.(y - 11)(y + 11)
A. y2 - 22
B. y2 - 121
C. y2 + 22y - 121
D. y2 - 22y - 121
Answer: B
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Solve the problem.Each ounce of a sweetened yogurt contains 30 calories, while each ounce of a "light" version of the same yogurt contains 4 calories. Write a formula that gives the number of calories C in x ounces of sweetened yogurt. Write a formula that gives the number of calories C in y ounces of "light" yogurt. If a person eats a 10-ounce container of "light" yogurt rather than a 10-ounce container of sweetened yogurt, what is the calorie difference?
A. C = 30 + x; C = 4 + y; 340 B. C = 30 ÷ x; C = 4 ÷ y; 34 C. C = 30x; C = 4y; 520 D. C = 30x; C = 4y; 260
Find the exact value of the expression.sin 25° cos 35° + cos 25° sin 35°
A. 
B. 
C. 
D. 
Use an identity to write the expression as a single trigonometric function or as a single number.
A. cot 13° B. tan 13° C. sin 13° D. cos 13°
Write the expression as a pure imaginary number.
A. -4i
B. -
i
C. 4i
D. ±4