Masks can provide additional protection against the coronavirus only if they: Replace other prevention measures
Come from a doctor
Have several layers of fabric
Are combined with other prevention measures

Graph the equationy=x^2 -[tex]y = x^{2} - 2[/tex]

For the chance to be team captain, the numbers 1-30 are put in a hat and you get two chances to pick a number, without replacement. which formula correctly shows how to find the probability that you choose the number 1 and then 2?

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )