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Answers by Michael W.

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Hi! The trouble here is converting the minutes and seconds of the angles. Complimentary angles total 90 degrees. There are 60 minutes in one degree, so you actually have 89 degrees and 60 minutes. There are 60 seconds in a minute, so now you have 89 degrees, 59 minutes, and 60 seconds. Now you can...

Good afternoon. The brackets indicated a nested parenthetical system. Using PEMDAS (parentheses, exponents, multiplication, division, addition, subtraction) form of order of operations, brackets "[]" would be a subset of parentheses.   [125-0.50(100)]/[100-0.50(100)]-1   You...

Good evening. SO4 is the most common form of the sulfur/oxygen polyatomic anions, so it is referred to as sulfate. The cation is called by its regular name, so this molecule is Barium sulfate.   I hope this helps   Mike

Good evening! This is commonly referred to as a "dirt" problem. D=rt (distance =rate times time). Since the time is the same, rearranging the equation we get t=D/r, so the distance upstream divided by the rate is equal to the distance downstream divided by the rate. The rate downstream...

Good evening! Yes, the answer is "a". The mass shown on the periodic table is the average of all isotopes of an element (taking into account the relative abundances of each isotope.   Yes, the answer is "d". If you look at columns, those "families" all...

Good afternoon. You simply plug in the values into the equation and test the inequality.   5(-1) +4(-3) = -17? -5 + -12 =-17 -17=-17   correct   2(-1) - (-3) = 1 -2 - -3 =1 -2+3=1 1=1   correct   So...

Force is mass times acceleration. F=ma. The force is the same (presuming no energy is lost converting from the hammer to the stake, which is not precisely true, but usually too small to significantly affect the result). Therefore mass of hammer times acceleration is equal to mass of stake times...

Hi! The formal definition of a valid scientific hypothesis is an educated explanation of a phenomenon based on prior information, previous knowledge, or other such support. Not to argue with Lewis, but the correct answer (at least from the position of life sciences) is all of the above.   Hypotheses...

Hi! Since the coefficient of the x^2 is 1 (1x^2), you have a quick method to do this. First identify the factors of 20 in pairs (20*1, 10*2, 5*4)   Now which pair when added or subtracted from each other gives you 8? 20+1=21, 20-1=19, 10+2=12, 10-2=8, 5+4=9, 5-4=1   You...