Pls help w this question !!

Determine the value of 2r² + r + 1 when: r= -0.2

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3

One astronomical unit (1 au) is about 1.496 alt tag missing. kilometers. if you wrote this number of kilometers in regular decimal notation (for example, 528 and 3,459 are written in regular decimal notation), how many zeros would your number have?