Ivan is a software salesman. let y represent his total pay (in dollars). let x represent the number of copies of history is fun he sells. suppose that x and y are related by the equation 70x + 2100 = y.

answer the questions below.
note that a change can be an increase or a decrease.
for an increase, use a positive number. for a decrease, use a negative number.

what is the change in ivan's total pay for each copy of history is fun he sells?

what is ivan's total pay if he doesn't sell any copies of history is fun?

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.

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i would you but i don't under stand the qustion

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