Make a number line and show all values of x such that x≤1 2/3 and x<− 3/4

The mathematical expression 9€ t means

Find the arc length parameter along the given curve from the point where tequals=0 by evaluating the integral s(t)equals=integral from 0 to t startabsolutevalue bold v left parenthesis tau right parenthesis endabsolutevalue d tau∫0tv(τ) dτ. then find the length of the indicated portion of the curve r(t)equals=1010cosine tcost iplus+1010sine tsint jplus+88t k, where 0less than or equals≤tless than or equals≤startfraction pi over 3 endfraction π 3.

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?