When solving the proportion x−26=1x+3, santos first starts by using the cross product property, multiplying the extremes and the means, to get 6=x2+x−6. then, he subtracts 6 from both sides of the equation 6=x2+x−6 and finds the equation 0=x2+x−12. part a: what should santos do next to solve the equation? part b: what is/are the solution(s) to the proportion? select one answer for part a, and select all answers that apply for part b.

  A: factor the equation to (x -3)(x +4) = 0

  B: solutions are x=-4, x=3

Step-by-step explanation:

A: Santos has the equation in standard form. Several options for solution are available: graphing (see attached), completing the square, factoring, using the quadratic formula. I find factoring to get to the solution most directly. The other methods work just as well.

To factor the equation, Santos needs to find two factors of -12 that have a sum of +1. Those would be +4 and -3. Putting these numbers into the binomial factors, Santos would have ...

  (x +4)(x -3) = 0

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B: The values of x that make the factors zero are ...

  x = -4, x = 3

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation: