Find the third proportional to 7 and 20.
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Ajob could be done by eleven workers in 15 days. five workers started the job. they were reinforced with four more workers at the beginning of the 6th day. find the total number of days it took them to finish the job.​

Sandra bought 2 3/4 yards ofred fabric and 1 1/4 of blue.how much cloth didshe buy in all? ​

In the figure,the curve y=2x^2-x-6 cuts the x-axis at two points a and b,and the y-axis at the point c. find the coordinates of a,b,and c.