What expression is equivalent to (3^2)^-2

How many grams must be adde to 970g to make 1 and a half kg

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0