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What is a radioactive isotope? Why are they radioactive?

What is the magnitude of the gravitational force on Mars, with a mass of #6.34 \times 10^ 23# and a radius of #3.43 \times 10^6#m?

Question #5c7c6

3. Below is the decay curve for bismuth210. What is the halflife for the radioisotope? What percent of the isotope remains after 20 days? How many halflife periods have passed after 25 days? How many days would pass while 32 grams decayed to 8 grams?

Roliver is three times as old as Cerise. Three years ago, the sum of their ages was sixtysix. Find their present age?

Find the maximum height that the Pohutukawa tree is expected to reach in cm?

How do you divide #y^48y^3+10y^2+2y+4# by y2 and is it a factor of the polynomial?

A worker’s salary is reduced by p%. By what percent would the salary have to be raised to bring it back to its original amount?

Explain why nucleus is the brain of cells ?

Question #35aac

2 men and 3 women take 16 days to complete a task. How long would it take for 4 men and 6 woman?

What is the slopeintercept form (y=mx+b) of xy=5?

What is the domain of the function g(x) = 3log2(x−1)+4 ?

Physics help, I'm not sure what this question is asking?

How do you solve the equation by graphing #2x^2  3x + 4 = 0#?

Question #f46fd

Question #871eb

An isosceles triangle has sides A, B, and C with sides B and C being equal in length. If side A goes from #(1 ,4 )# to #(5 ,8 )# and the triangle's area is #27 #, what are the possible coordinates of the triangle's third corner?

Differentiate #cos(x^2+1)# using first principle of derivative?

How do you approximate the height of the screen to the nearest tenth?

Question #74e81

Question #301e8

Question #c7208

Given the function: f (x)= 3(x+2)² + 5, how do you rewrite in standard form?

How many grams of CaCl2 would you use to make 500 ml of a 6mM calcium salt solution? CaCl2=110

How much energy is needed to heat up 10 litres of water for a bath, if the temperature of cold water is 10 degrees and the bath temperature is 38 degrees?

How do you graph the parabola #y=  x^2  6x  8# using vertex, intercepts and additional points?

How do you evaluate #\sqrt { \frac { 27} { 9} } + 5#?

Question #9c03c

How do you write an equation for the alpha decay of Actinium218?

A fighter jet is flying in a tight circle with a radius of 250m. It makes one complete turn in 20 seconds. How fast is the plane flying?

A charge of #8 C# is passing through points A and B on a circuit. If the charge's electric potential changes from #36 J# to #6 J#, what is the voltage between points A and B?

How do you find the domain and range of #f(x) = 2 / sqrt(3x2)#?