The path of a foam ball shot from a toy gun can be described by the equation Ax) = -x + 4x + 7, where f(x) is the height of the foam ball and x is the number of seconds
=
that have passed since the toy gun's trigger was released. Which of the following points
shows the extremum for the function?

Which themes are portrayed in this excerpt from leo tolstoy’s the death of ivan ilyich? praskovya fedorovna came of a good family, was not bad looking, and had some little property. ivan ilyich might have aspired to a more brilliant match, but even this was good. he had his salary, and she, he hoped, would have an equal income. she was well connected, and was a sweet, pretty, and thoroughly correct young woman. to say that ivan ilyich married because he fell in love with praskovya fedorovna and found that she sympathized with his views of life would be as incorrect as to say that he married because his social circle approved of the match. he was swayed by both these considerations: the marriage gave him personal satisfaction, and at the same time it was considered the right thing by the most highly placed of his associates. so ivan ilyich got married. conforming to social conventions criticism of a middle class lifestyle the destructive impact of loneliness struggling to face reality the necessity of companionship

Anyone know? will mark brainliest if correct

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?