What could be the first step in solving the equation 13x^2+9=45?
a. multiply both sides of the equation by 13.
b. take the square root of both sides of the equation.
c. add 9 to both sides of the equation.
d. subtract 9 from both sides of the equation.

Which conjunction is disjunction is equivalent to the given absolute value inequality? |x+2|< 18

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?