10/28/22

The exponential model A=477e^0.009t describes the population, A, of a country in millions, t years after 2003. Use the model to determine when the population of the country will be 536 million.
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10/28/22

A committee of 4 people will be chosen randomly from 5 boys and 6 girls. How many different committees can be chosen?
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10/28/22

Estimate the boiling point of benzene (C6H6) using its ΔH° and ΔS°.
a. Estimate the boiling point of benzene (C6H6) using its ΔH0 and ΔS0. (C6H6 (l) ΔH° = 49.0 kJ/mol, ΔS° = 172.8 J/mol*K, C6H6 (g): ΔH° = 82.9 kJ/mol, ΔS° = 269.2 j/mol*K)b. The actual boiling point... more
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10/28/22

Consider a standard deck of 52 cards. If the cards are drawn at random, without replacement, what is the probability that there are exactly 2 aces?
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10/28/22

Let A be the area of a circle with radius r . If dr/dt = 3 , find dA/d t when r = 2 .
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10/26/22

find the aria between 2 curves

Find the area of the region enclosed between 𝑦=2sin(𝑥)  and 𝑦=4cos(𝑥)from 𝑥=0to 𝑥=0.8pi. Hint: Notice that this region consists of two parts. 
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10/24/22

Differential Equations! Help!

Which of the following functions would be solutions to the differential equation y”-5y’-14y=0A. y(x)=e-xB. y(x)=e7xC. y(x)= 0D. y(x)= 7xE. y(x)= e-2xF. y(x)= -2xG. y(x)= exthere is more than one... more
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10/24/22

Oil spilled from a ruptured tanker spreads in a circle whose area increases at a constant rate of 3 mi^2/hr. How rapidly is the radius of the spill increasing when the area is 6 mi^2?
Oil spilled from a ruptured tanker spreads in a circle whose area increases at a constant rate of 3 mi^2/hr. How rapidly is the radius of the spill increasing when the area is 6 mi^2?Find the... more
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10/24/22

why is alternative hypothesis said to be “supported” but not said to be “proven”?

Is it because of the statistical procedure to prove statement or is it the bid involved in supporting certain confidence? Thanks
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10/24/22

What is the temperature of the cake after 35 minutes?

- kt Over a period of time, a hot object cools to the temperature of the surrounding air. This is described mathematically by Newton's Law of Cooling T=C+ (To-C) e where t is the time it takes for... more
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10/24/22

Help differentiation

Find derivatives f(t) = (t2 + 2t)5
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10/23/22

What type of reaction is C2H4 + 42.1 kcal --------> H2 + C2H2? (Exothermic or Endothermic)
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10/23/22

Need help with parts C and D as soon as possible (assignment is due Monday)
"A fictional cubed-shaped bacterium, Bacterius cubis, occupies a volume of 2.6 femtoliters. This particular type of bacteria is known to communicate with its own species by secreting a small... more
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10/23/22

Speed of gases at the same temperature
Which one of the following gases would be expected to have the highest speed if all the gases were at the same temperature?A) O2B) N2C) F2D) H2
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10/23/22

Investigate the relationship between surface area and volume of cuboids
• How can you change the surface area of a cuboid while keeping the volume the same?• How can you change the volume of a cuboid while keeping the surface area the same?Make conclusions by... more
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10/23/22

What is the number of moles of hydrochloric acid with known percent concentration and density?

How to find the number of mole of 2.00 mL of hydrochloric acid with 37% concentration and density of 1.19 kg/l ?
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10/23/22

Population Growth Problem
Suppose that the number of bacteria is observed to double after 9 days, and the estimated carrying capacity is 7 times the initial population. What is the estimated population, as a multiple of the... more
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10/23/22

Solve by inspection...

( x3+ x y2 +y ) d x + ( y3 + x2 y + x ) d y = 0 x4 y' = -x3 y - csc(xy)
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10/23/22

Differential Equation
a) Let y‴−10y″+21y′=0. Find all values of r such that y=erx satisfies the differential equation. If there is more than one correct answer, enter your answers as a comma separated list. b)... more
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10/21/22

Path of a ball- Quadratics Word Problem
A ball is thrown across a playing field. Its path is given by the equation y=-0.005x^2 +x+5 where x is the distance the ball has traveled horizontally and y is its height above ground level, both... more
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10/20/22

Zeros of Polynomial Functions
Find an nth- degree polynomial function with real coefficients satisfying the given conditions. If you are using a graphing utility, use it to graph the function and verify the real zeros and the... more
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10/20/22

Integrate ~tan^2×sec^6×dx
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10/20/22

Need help calculating the molarity
An aqueous potassium iodate (KIO3KIO3) solution is made by dissolving 529529 grams of KIO3KIO3 in sufficient water so that the final volume of the solution is 4.604.60 L. Calculate the molarity of... more
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10/20/22

Company life probability

11 percent of a certain company's life insurance policy holders are smokers. For each nonsmoker the probability of dying during the year is 0.009. For each smoker the probability of dying during... more
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10/20/22

Evaluate the integral by parts

upper bound = 1 lower bound = 0 -5y/e2y
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