# Logarithm - math problems

#### Number of problems found: 50

- Logarithm

Determine the number whose decimal logarithm is -3.8. - Seating rules

In a class are 24 seats but in 7.B class are only 18 students. How many ways can students sit? (The class has 12 benches. A bench is for a pair of students.) Result (large number) logarithm and thus write down as powers of 10. - Log

if ?, what is b? - Powers 3

2 to the power of n divided by 4 to the power of -3 equal 4. What is the vaule of n? - Sequence

Calculate what member of the sequence specified by (5^{n-2}+15) has value 20. - Log

Calculate value of expression log |3 +7i +5i^{2}| . - Exp

If sqrt[7](20^{2}-12^{2}) = sqrt[n](256), then n is: - Exponential equation

Solve for x: (4^x):0,5=2/64. - Radioactivity

After 548 hours decreases the activity of a radioactive substance to 1/9 of the initial value. What is the half-life of the substance? - Exponential equation

In the set R solve the equation: ? - What is

What is the annual percentage increase in the city when the population has tripled in 20 years? - Intercept with axis

F(x)=log(x+4)-2, what is the x intercept - Gain

Find the gain whenever the output power is 21x the input power. - Logarithmic equation

Solve equation: log_{13}(7x + 12) = 0 - Dice

How many times must throw the dice, the probability of throwing at least one six was greater than 90%? - Car value

The car loses value 15% every year. Determine a time (in years) when its price will halve. - Compound interest

Calculate time when deposit in the bank with interest 2.5% p.a. doubles. - Coordinate

Determine missing coordinate of the point M [x, 120] of the graph of the function f bv rule: y = 5^{x} - Sum-log

The sum of two numbers is 32, the sum of their logarithms (base 10) is 2.2. Determine these numbers. - An investment

How long will it take for an investment to double at a simple interest rate of 5.10% per annum? Express the answer in years and months, rounded up to the next month.

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