The sum of 4 times a number and 5 equals 9. can someone please help

1

Step-by-step explanation:

let the number be x

4 times = 4x

the sum of 4 times a number and 5 equals to 9

4x + 5 = 9

4x = 9 - 5

4x = 4

divide both sides by 4

x = 1

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Step-by-step explanation:

i think the answer is seven, for if i'm being useless °ω°

step-by-step explanation:

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.

click to let others know, how is it

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