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Does anyone can help me explain the difference between the US concrete standard ASTM C150/150M 16 and 16e1? D2ydx2, as a function of t, for the given the parametric equations:
xy==7−9cos(t)2+cos4(t)
d2ydx2= .? Calculate the concentration of salt formed (M) and amount of salt formed (g), if:
0.5 L of 0.2 M HCl mixed with 0.5 L of 0.2 M NaOH? Points A(2,6), B(5,7) and C(8,-2) lie on a circle. Show that the triangle ABC has a right angle. Please help? What organic material can be used to filter air from the a.c?

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