The given rates are in hours per gallon. If we rewrite them in terms of gallons per hour, we have ... ... Jenny + Penny = 1/2 . . . . gallon per hour

... Penny + Lenny = 3/5 . . . gallon per hour

... Jenny + Penny + Lenny = 1 . . . gallon per hour

Subtracting the 2nd equation from the last, we have ...

... (Jenny +Penny +Lenny) -(Penny +Lenny) = (1) -(3/5)

... Jenny = 2/5 . . . . gallon per hour

It will take Jenny 5/2 = 2.5 hours to eat a gallon of ice cream by herself.

answer: c

because if you look at the chart you can see a pattern and compare it to the question he simplify out your

but i think the formula is f(x)=6x

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:

a

step-by-step explanation: