Chang currently has $42 in savings. he had been saving $7 each week. yesterday he spent $77 of the savings. for how many weeks had he been saving?

5 Weeks

Step-by-step explanation: I believe 5 weeks is the answer because If he has 42$ in savings currently you get that number and subtract it from 77. Once you do this you need to get 35 which is the sum of 77-35 and divide it by 7. This will get you 5 weeks.

6.9

step-by-step explanation:

simple math really

6 1/2 times 0.6 = 3.9

but if you are just doing 6 and not 6 1/2 then the answer is 3.6

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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