Helena was curious if quadrilaterals QRST and XYZW were congruent, so she tried to map one figure onto the other using transformations: Helena concluded: "It's not possible to map QRST onto XYZW sing a sequence of rigid transformations, so the quadrilaterals are not congruent." What error did Helena make in her conclusion? WILL GIVE BRAINLIEST!!!

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

If you have the following equation, 2/3x+5/6-x=2-3/4x what would you multiply each term by to get rid of all the fractions

What is the absolute value of the complex number -4-sqrt2i