How do you write 70,000,000+4000,000+10,00+8,000+500 +30+9 in standard form

Why did the ice arena get so hot after the big game (this is math related google it to find the paper

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126

Add the fractions and simplify 1/2+ 1/3