Aline passes through the point (–2, 7) and has a slope of –5. what is the value of a if the point (a, 2) is also on the line? –7 –1 1 7

Can someone me out here number 4 plz

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n