Identify if the whole number is prime or composite.56
A. Composite
B. Prime
Answer: A
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Use sum-to-product identities to rewrite the expression as a product.sin 51° - sin 21°
A. 2 sin 36° cos 15° B. -2 sin 36° sin 15° C. 2 cos 36° sin 15° D. 2 cos 36° cos 15°
Factor the trinomial, if possible.12z2 - 7z - 12
A. (4z - 3)(3z + 4) B. (12z + 3)(z - 4) C. (4z + 3)(3z - 4) D. (12z + 1)(z - 12)
Subtract. Use borrowing, if necessary.
A. 331 B. 355 C. 5355 D. 351
Solve the problem.An express train and a local train leave Gray Lake at 3 P.M. and head for Big City 50 miles away. The express travels twice as fast as the local and arrives 1 hour ahead of the local. Find the speed of each train.
A. Express train's speed = 60 mph and local train's speed = 30 mph. B. Express train's speed = 25 mph and local train's speed = 12.5 mph. C. Express train's speed = 50 mph and local train's speed = 25 mph. D. Cannot be determined with information given.