cjdalliance
Calculators
General
Algebra
Geometry
Coordinate-geometry
Statistics
Calculus
Qna
Math
cjdalliance
cjdalliance
Home
General
Algebra
Geometry
Coordinate-geometry
Statistics
Calculus
Qna
Math
MATH SOLVE
Home
Use differentials to estimate the amount of metal in a closed cylindrical can that is 26 cm high and 10 cm in diameter if the metal in the top and the bottom is 0.3 cm thick and the metal in the sides is 0.05 cm thick. (Round your answer to two decimal places.)
General
2 months ago
The rate of change of the volume of a snowball that is melting is proportional to the surface area of the snowball. Suppose the snowball is perfectly spherical. Then the volume (in centimeters cubed) of a ball of radius r centimeters is 4/3πr3. The surface area is 4πr2. Set up the diﬀerential equation for how r is changing. Then, suppose that at time t = 0 minutes, the radius is 10 centimeters. After 5 minutes, the radius is 8 centimeters. At what time t will the snowball be completely melted?
General
2 months ago
Suppose that the time (in hours) required to repair a machine is an exponentially distributed random variable with parameter λ=0.9. What is (a) the probability that a repair time exceeds 8 hours? 1-e^(1/0.9*8) (b) the conditional probability that a repair takes at least 13 hours, given that it takes more than 9 hours? Note: You can earn partial credit on this problem. Your score was recorded. You have attempted this problem 3 times. You received a score of 0% for this attempt. Your overall recorded score is 0%. You have unlimited attempts remaining.
General
2 months ago
Researchers measured the data speeds for a particular smartphone carrier at 50 airports. The highest speed measured was 78.2 Mbps. The complete list of 50 data speeds has a mean of x overbarequals18.22 Mbps and a standard deviation of sequals23.87 Mbps. a. What is the difference between carrier's highest data speed and the mean of all 50 data speeds? b. How many standard deviations is that [the difference found in part (a)]? c. Convert the carrier's highest data speed to a z score. d. If we consider data speeds that convert to z scores between minus2 and 2 to be neither significantly low nor significantly high, is the carr
General
2 months ago
A signal in a communication channel is detected when the voltage is higher than 1.5 volts in absolute value. Assume that the voltage is normally distributed with a mean of 0. What is the standard deviation of voltage such that the probability of a false signal is 0.05?
General
2 months ago
A farmer in China discovers a mammal hide that contains 68% of its original amount of c-14.N=n0e^ktNo=amount of c-14 at time t K=0.0001 T=time in yearsFind the age of the mammal hide to the nearest year.
General
2 months ago
During a reading test, Enrique reads a passage with 640 words. It takes him 4 minutes toread the passage.c) How long would it take Enrique to read a passage that has 800 words if hereads at the same speed?Words
General
2 months ago
19÷25=x÷100Cross multiply
General
2 months ago
Find the measure of two supplementary angles if the diffrence in measure of the two angles is 24
General
2 months ago
What is the percent of change if I increase $3.00 to $4.50?
General
2 months ago
polynomial expressions with matching
General
2 months ago
A punch bowl is in the shape of a hemisphere (half of a sphere) with a radius of 10 inches. The cup part of a ladle is also in the shape of a hemisphere with a radius of 6 inches. If the bowl is full, how many full ladles of punch are there in the bowl?
General
2 months ago
A random sample of 250 students at a university finds that these students take a mean of 15.3 credit hours per quarter with a standard deviation of 1.6 credit hours. Estimate the mean credit hours taken by a student each quarter using a 95% confidence interval. Round to the nearest thousandth.
General
2 months ago
A recipe requires one quarter cup of milk as a base and then, in addition, 1 cup of milk for every 4 cups of flour. Choose a linear equation that describes the relationship.
General
2 months ago
) A random sample of 110 lighting flashes in a certain region resulted in a sample average radar echo duration of 0.81 sec and a sample standard deviation of 0.34 sec. Calculate 99% (two-sided) confidence interval for the true average echo duration µ.
General
2 months ago
When a truckload of apples arrives at a packing plant, a random sample of 150 is selected and examined for bruises, discoloration, and other defects. The whole truckload will be rejected if more than 5% of the sample is unsatisfactory. Suppose that in fact 8% of the apples on the truck do not meet the desired standard. What's the probability that the shipment will be accepted anyway?a. 0.0222b. 0.9778c. 0.088d. 0.912
General
2 months ago
What do s the constant proportionality in the equation y= 5x
General
2 months ago
60 points !! i'll mark brainliest as well . don't scam or i'll report thanksss :)
General
2 months ago
Laneka owns a cake shop. She is currently preparing cakes for two anniversary parties. The first cake has 3 small tiers and 1 medium tier and will serve a total of 100 guests. The second one has 3 small tiers and 2 medium tiers and will serve a total of 140 guests. 1.Represent the situation with a system of equations. 2. Solve the System of equations.
General
2 months ago
Victoria wants to purchase a skateboard. She has $125 to spend. She finds one that regularly sells for $139.99 and is on sale for 15% off. The sales tax is 7%. Victoria says that she has enough money to buy the skateboard.
General
2 months ago
Previous
1
2
3
4
5
6
7
8
9
10
11
12
13
Next