Is finding 9/10 minus 1/2 the same as finding 9/10 minus 1/4 minus 1/4? explain. this is due tomorrow!

Liesl grew 7/12 of a foot in one year. her little sister grew 1/3 of a foot during that same year. how much more did liesl grow than her little sister did

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)