- How to verify this trig identity? # 45 and 47?

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How many molecules and grams of hydrogen gas (H2) are present in 6.070 x 1023 amu of H2? (1 amu = 1.661 x 10-24 g)? Plz help me understand? How many grams of NaCl, m.w. 58.5 daltons, are the molar equivalent to 90 g of glucose (m.w. 180 daltons)? Please Help me with this example..
I do not know what 0+ means in the probability distribution . See picture for more information.? Passes through (2,3), Focus (2,0) and center at the origin. What is the equation of the parabola? How many grams of NaCl, m.w. 58.5 daltons, are necessary to make 1 liter of 5 percent saline?