Problem $4$

Consider the list

car $<-$ list$($model $=$ c$("$Ford$","$BMW$"),$

price $=$ c$(23000,30000),$

color $=$ c$("$Red$",$ "Black"$),$

sold$\_$last$\_$week $=$ list$($ws$\_$ford $=$ c$(1,3,4,4,5,6),$ ws$\_$BMW $=$ c$(1,2,0,1,3,0)))$

The code that will extract, in a vector of length $2,$ the number of BMW cars sold on the first and the third day of last week is

A$.$ car$[[4]][2][$c$(1,3)]$

B$.$ car$[4][[2]][$c$(1,3)]$

C$.$ car$[4][2][$c$(1,3)]$

D$.$ car$[[4]][[2]][$c$(1,3)]$

Answer:$\_\_\_\_\_\_\_\_$

problem $5$

Let x $<-$ c$(-2,3,-4,5,-6,7,8)$ is a vector. The result of executing the code x $>0$ is

A$.$ TRUE FALSE TRUE FALSE TRUE FALSE FALSE

B$.$ FALSE TRUE FALSE TRUE FALSE TRUE TRUE

C$.$ FALSE TRUE FALSE TRUE FALSE TRUE FALSE

D$.$ TRUE TRUE FALSE TRUE FALSE TRUE TRUE

Problem $6$

Consider the function

f $<-$ function$($x $=-10,$ y $=5)\{$

return$($y$^2-$ abs$($x$))$

$\}$

What is the value of f$(3,)$

A$.1$

B$.22$

C$.-1$

D$.15$