- Can u help me answer this problem x-8=4x+121 thanks : ] ; ]?

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Am I Sherree Herdman? Find the exact length of the curve.? If cos (xy) = y, what is the value of y' at point (1+ π/2)? F(x) = (x+1)(x+2)....(x+100), and x takes only integer values. Need to find for how many values of x is f(x) < 0? What pressure in mmHg could 15.0 g of neon gas in a vessel of volume 1.50 dm3 and temperature of 20°C exert?