You are working on some practice
problems for
homework. You
have 90 problems
to do over the
weekend. You
finish 20 on Friday
night and 30 on
Saturday, how
many do you have
to do on Sunday?
Type an complete sentence what the answer is. And write a number sentence for the question.

40

Step-by-step explanation:

you start by haveing 90  homework prombelms.since yo u are completeine theproblems we will use substraction.

90 - (20 + 30)

90 - 50 = 40

you have 40 more problems to finish on sunday.

360 different combinations

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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