Ineed ! asap, & you! i don't really understand what it means, or even how to answer it, for that matter, if someone could , i'd be gladly

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?

Three times the sum of a number and seven is negative thirty-six. what is the number?