Tutors Answer Your Questions about Exponents (FREE)
Question 97889: A boojum is avery slow growing catcus. One-fifty-yearoldboojum is 1.5meters tall and has been growing about 0.03 meter each year. assume the groth patern contunies. a.write a expression for the height in metersof the boojum y years from now. b.how tall will the boojum be in 50 years
Click here to see answer by waiwai933(6)  |
Question 108790: 2. In the following equation, if x is measured in meters and t is measured in seconds, identify the units on the variable v. x = vt
3. In the following equation, determine the units on t if S is measured in dollars and p is measured in dollars per year. S=pt
Click here to see answer by MathLover1(6638)  |
Question 110844: 9 to the ninety ninth power is a very great number, but you can write an ever greater one using three nines. What is the greatest number that an be written using three nines? (Written out, this number contains over 300 million digits.)
Click here to see answer by scott8148(6628)  |
Question 112151: This question deals with an exact formula. In the following exercise use the approximate and exact formulas to find the doubling time. Also answer the given question.
38. A family of 100 termites invades your house and grows at a rate of 20% per week. How many termites will be in your house after 1 year?
The approximate doubling time formula (rule of 70): for a quantity growing exponentially at a rate of P% per time period, the doubling time is approximately Tdouble = 70/P. This approximation works best for small growth rates and breaks down for growth rates over about 15%. This is the exact doubling time formula: For an exponentially growing quantity with a fractional growth rate r, the doubling time is Tdouble = log10 2/log10(1 + r). For an exponentially decaying quantity, we use a negative value for r (for example, if the decay rate is 5% per year, we set r = -0.05 per year); the half-life is Thalf= - log10 2/log10(1 + r). Note that the units of time used for T and r must be the same. For example, if the fractional growth rate is 0.05 per month, then the doubling time will also be measured in months.
Click here to see answer by stanbon(57407) |
Question 112150: This question deals with the half-life formula. Use the approximate half-life formula in this exercise. Be sure to discuss whether the formula is valid for the case described.
32. A clean-up project is reducing the concenration of a pollutant in the water supply with an 8% decrease per week. What is the half-life of the concentration of the pollutant? What fraction of the original amount of the pollutant will remain when the project ends after 1 year (52 weeks)?
This is the approximate half-life formula: For a quantity decaying exponentially at a rate of P% per time period, the half-life is approximately Thalf = approximately 70/P. This approximation works best for small decay rates and breaks down for decay rates about 15%.
Click here to see answer by stanbon(57407) |
Question 112220: If Gary likes 11 but not 99, and 112 but not 198, what other pair describes Gary correctly?
a) 105 but not 199
b) 345 but not 348
c) 735 but not 763
d) 733 but not 767
State how you found your answer. If you found a pattern, state that, too.
Click here to see answer by rainxroses(1) |
Question 112294: A square support unit in a television is made with a side measuring 3 centimeters. A new model being designed for the upcoming year will have a larger square with a side measuring 3.2 centimeters. By how much will the area of the square be increased?
Click here to see answer by jim_thompson5910(28598) |
Question 112315: An aluminum plate is made according to the following dimensions. The outer radius is 10 inches and the inner radius is 3 inches. (See diagram below) Use = 3.14 as an approximate value. (a) How many square inches in area is the aluminum plate (the shaded region)? (b) If the cost to construct the plate is $7.50 per square inch, what is the construction cost?
Click here to see answer by checkley71(8403) |
Question 112387: Can anyone please help me solve these two problems. I am really confused. And not sure what I am doing. PLEAS HELP.
1)The area of a square is 25 square meters. What is it's perimeter?
2) A square support unit in a television is made with a scale measuring 3 centimeters. A new model being deigned for the upcoming year will have a larger square with a side measuring 3.2 centimeters. By how much will the area of the square be increased?
Click here to see answer by Earlsdon(6287) |
|
Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455
|
