Help me please if you 100% know it:)

Mathematics

2 answers:

Dmitriy789 [7]2 years ago

5 0

Its 4 people because there are 2 who studied 4 hours, 1 who studied 5, and another one for 8.5, and 2 + 1 + 1 = 4

vichka [17]2 years ago

4 0

The answer is 4 because 2 studied for 4 hours and 1 studied for 5 hours and 1 studied for 8 hours. the number of students that studied AT LEAST 4 hours, so this would be described by the inequality x>=4

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Math Help Please explain the questions How long will it take for the balance of an account to double if the savings account earn

Scorpion4ik [409]

(See attached formula)
Years = log (total / principal) / n*log(1 + rate/n) where n = compounding periods per year
Years = log (total / principal) / n*log(1 + rate/n)
Rate of .75% = .0625 per month
We'll say we want total = 200 and principal = 100
Years = log (200 / 100) / 12*log(1 + rate/n)
Years = log (2) / 12 * log (1 + .0625/12)
Years = 0.3010299957 / 12 * 0.0022560803 
Years = 0.3010299957 / 0.0270729635 
Years = 11.1192110871 
I don't think that's right
The interest rate is REALLY low. (Less than 1%)
Rate = .75 and .0075 when in a formula
Years = log (2) / 12 * log (1 + .0075/12)
Years = log (2) / 12 * log( 1.000625)
Years = 0.3010299957 / 12 * 0.0002713493 
Years = 0.3010299957 / 0.0032561912 
Years = 92.4485010892
THAT seems a more likely answer with such a low interest rate.