# Logarithm + exponential equation - math problems

#### Number of problems found: 38

• Exponential equation
In the set R solve the equation: ?
• Exponential equation
Solve exponential equation (in real numbers): 98x-2=9
• Exponential equation
Find x, if 625 ^ x = 5 The equation is exponential because the unknown is in the exponential power of 625
• Exponential equation
Solve for x: (4^x):0,5=2/64.
• Log
if ?, what is b?
• Exp
If ?, then n is:
• Sequence
Calculate what member of the sequence specified by ? has value 86.
• Coordinate
Determine missing coordinate of the point M [x, 120] of the graph of the function f bv rule: y = 5x
• Compound interest
Calculate time when deposit in the bank with interest 2.5% p.a. doubles.
• Car value
The car loses value 15% every year. Determine a time (in years) when the price will be halved.
• Geometric sequence
In the geometric sequence is a4 = 20 a9 = -160. Calculate the first member a1 and quotient q.
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?
• What is
What is the annual percentage increase in the city when the population has tripled in 20 years?
• Geometric progression
In geometric progression, a1 = 7, q = 5. Find the condition for n to sum first n members is: sn≤217.
• Demographics
The population grew in the city in 10 years from 30000 to 34000. What is the average annual percentage increase of population?
• Decibel
By what percentage does the sound intensity increase if the sound intensity level increases by 1 dB?
• The city 3
The city has 22,000 residents. How long it is expected to have 25,000 residents if the average annual population growth is 1.4%?
• Powers 3
2 to the power of n divided by 4 to the power of -3 equal 4. What is the vaule of n?
• Water lilies
Water lilies are growing on the pond and their number is doubled every day. The whole layer is covered in 12 days. How many days will it cover 8 layers?
• Geometric sequence 3
In geometric sequence is a8 = 312500; a11= 39062500; sn=1953124. Calculate the first item a1, quotient q and n - number of members by their sum s_n.

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Logarithm - math word problems. Exponential equation - math word problems.