What is the name of a quadrilateral that has 4 right angles and 4 sides of eqal lenght

Which of the following is true for the relation f(x)=2x^2+1

Tod does not have any cookies. david gives jeff 8 cookies. then he splits half of the cookies he has left with tod. david let’s c represent the number of cookies that he starts with. he finds the number of cookies that tod has is 1/2 the difference of c and 8. write an expression to represent the number of cookies that tod has.

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9