6*f+6=7+11

Me ayudan a resolverlo?

Complete the square (y=-16x^2+64x+60)

Consider a collection of envelopes consisting of 3 red envelopes, 2 blue envelopes, 2 green envelopes, and 3 yellow envelopes. If three envelopes are selected at random, without replacement, determine the probability that they are all red envelopes.

The center circle of a soccer field has a diameter of 20 yards. What is the approximate area of the center circle? 62.8 square yards 125.6 square yards 314 square yards 1,256 square yards

Frank has two same size rectanles divided into the same number of equal parts. One rectangle has 3/4 of the parts shaded and the other has 1/3 of the parts. Is there more than one possible answer

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Name another fraction that is equivalent to 4/7

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Angelica solves the system { x + y = - 3. x - y = 1 } and finds the solution (1, 3). Use substitution to explain whether Angelica's solution is correct.