Use sum-to-product formulas to rewrite the expression as a product.cos 46° + cos 40°
A. 2 sin 43° cos 3°
B. 2 cos 43° cos 3°
C. -2 sin 43° sin 3°
D. 2 cos 43° sin 3°
Answer: B
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Solve the problem.The half-life of a certain radioactive substance is 13 years. Suppose that at time t = 0 , there are 20 g of the substance. Then after t years, the number of grams of the substance remaining will be N(t) = 20(1/2)t/26How many grams of the substance will remain after 39 years?
A. 0.88 g B. 1.77 g C. 7.07 g D. 3.54 g
Write the whole number in words.235,060
A. Twenty-three thousand, five hundred sixty B. Twenty-three thousand, five hundred six C. Two million, thirty-five thousand, sixty D. Two hundred thirty-five thousand, sixty
Find the following using a calculator. Round to four decimal places.ln 0
A. -0.6697 B. -0.7054 C. Does not exist D. -0.6808
Solve the equation and check your solution.-42.9m = -429
A. 386.1 B. 0.1 C. 419 D. 10