Julie went to the post office and bought both 41-cent stamps and 26-cent postcards. she spent $51.40. the number of stamps was 20 more than twice the number of postcards. how many of each did she buy? stamps= ? postcards= ?

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.

What is always true about a positive integer raised to a negative odd power?

Suppose that in 2008 , 840,800 citizens died of a certain disease assuming the population of teh country is 399 miliion, what is the mortality rate in units of deaths per 100,000 people?