Three students were given the expression shown and were asked to take a common factor out of two of the terms. 4-9x+21

Chang: 4-3(3x+7)
Chang’s expression is ___ because _.

Benjamin: 4+3(3x+7)
Benjamin’s expression is ___ because _.

Habib: 4+12x
Habib’s expression is ___ because _.

Equivalent Expression
The correct simplification of this expression _.

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Se tiene en una caja de canicas 10, 4 blancas y 6 negras ¿cual es la probabilidad que en 2 extracciones con reemplazo sean blancas? ¿cual es la probalidad que en 2 extracciones sin reemplazo sean negras?

Aroulette wheel has 38 slots in which the ball can land. two of the slots are green, 18 are red, and 18 are black. the ball is equally likely to land in any slot. the roulette wheel is going to be spun twice, and the outcomes of the two spins are independent.the probability that it lands one time on red and another time on black in any order is(a) 0.5 (b) 0.25 (c) 0.4488 (d) 0.2244

Rewrite 9 log, x2 in a form that does not use exponents. 9log, x = log, x