use equations to solve the following problems

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use equations to solve the following problems

The amount of alcohol in the bloodstream, A, declines at a rate proportional to the amount. That is, dA/dt = kA If k=-0.3 for a person, how long will it take for his alcohol concentration to decrease...

The results of a certain medical test are normally distributed with a mean of 125 and a standard deviation of 10. Use the table to find the percentage of people with readings between 116 and 134....

x4 + a*x3 -3*x2 +2x+b

The total operating cost for a truck is $400 000 per year. The percentage breakdown of this total amount was 40 percent fixed costs, 30 percent fuel, 20 percent finance, 10 percent maintence. Suppose...

Using the facts that sine (-beta)= sine beta and cosine(-beta)=cosines beta to prove that sine alpha cosine alpha is less than 1/2 prove that sine alpha+ cosine alpha <= radical...

y=x^(log3(x)) Then dydx = ?? please express answer in terms of natural logs

1. Write as a single log 2logx - log11y + 1/2 log 11z 2. Evaluate 3log74 -2log78 3. Expand logw(12a3/b2) thank you soo much!!

Math problem

Math problem

Math problem

Word Problems in 1980 the average price of a Home in Brainerd County was 93,000. By 1985 the average price of a home was $108,000. Which of the following is a linear model for the price of a...

Math problem

I have a mystery solution lab in Chemistry and I was wondering if H2SO4 and NH4OH give off heat? Or maybe there is a precipitate or color change? Thanks

How many pounds of nuts selling for $12 per lb and raisins selling for $6 per lb should a person combine to obtain 120 lb of a trail mix selling for $8 per lb? The person would need ( ) lb...

Mrs. Peterson wrote the expression below on the chalkboard for her class. She asked the students to write an equivalent expression using no more than one set of parentheses. 8(4x +...

Question #1 4.86 g of Ag2SO4 will dissolve in 1 l of water. Calculate the solubility product constant for this salt Question #2 H2 and Cl2 combine...

Math problem

In a field there are cows, sheep and ducks. There are more sheep than ducks. The sheep and ducks between them have a hundred heads and legs (added together), and there are three times as many sheep...

A baritone guitar has a longer neck than a normal guitar. A mandolin has a much shorter neck than a normal guitar. When notes are played on all of the instrumentâ€™s top (thickest) string, which guitar...

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