Which statements are correct regarding mathematics in the egyptian, chinese, and babylonian cultures? check all the apply.

a.) both the egyptian and chinese number systems use base 10.
b.)the babylonian tablets have all the solution methods clearly shown.
c.)all three cultures had unique symbolism to represent their numbers.
d.)there are two primary sources for ancient egyptian mathematics.
e.)ancient chinese mathematicians did not attempt to solve systems of linear equations.

The rate of decay of a radioactive substance depends upon the amount present initially. the mass y (mg) of the radioactive substance cobalt-60 present in a sample at time t (years) is represented by the exponential equation y=50e −0.1315 t . answer the following questions in complete sentences. 1. how does the exponential equation above compare to the equation for simple interest that is compounded continuously? explain the similarities. 2. what is the initial amount of cobalt-60 in the sample? 2. how much cobalt-60 is left after 8.4 years? show your work. 3. what would be the y-intercept of the graph? what does it represent? 4. after how many years will the amount of cobalt-60 left be 6.25 mg? explain what happens to the cobalt-60 after 50 years? 5. discuss some “real-world” examples and uses of cobalt-60

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct