5y-4x=-7 what does x equal

Step-by-step explanation:

5y - 4x = - 7

5y - 4x + 4x = - 7 + 4x         [adding + 4x on both sides ]

5y + 7 = - 7 + 7 + 4x            [adding 7 on both sides , - 4x + 4x = 0 ]

5y + 7 = 4x                         [ -7 + 7 = 0 ]

                           [ dividing by 4 on both sides ]

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: