Take a look at these equations: 8-10x=7+5x and 4-10x=3+5x. What move did the student do to the first equation in order to turn it into the second equation? *

Subtracting 4 from both sides

Step-by-step explanation:

Given the equation 8-10x=7+5x, the student made a move by subtracting 4 from both sides to arrive at the equation 4-10x=3+5x.

==>See:

8-10x = 7+5x

=>Subtract 4 from both sides

8 - 10x - 4= 7 + 5x - 4

=>Take like terms on both sides

(8 - 4) - 10x = (7 - 4) + 5x

4 - 10x = 3 + 5x

This is how the student arrived at the equation 4 - 10x = 3 + 5x

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: