Can someone help me with this one please? cos 2x° = 0.64 in the interval. Give the explanation

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

Find the value of x that will make l ll m

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items