11 protons, 12 neutrons, and 11 electrons. what is the atomic mass of the atom? * 1 point

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

An arithmetic series a consists of consecutive integers that are multiples of 4 what is the sum of the first 9 terms of this sequence if the first term is 0

An unknown number x is at most 10. which graph best represents all the values of x? number line graph with closed circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the left. number line graph with closed circle on 10 and shading to the left.