In the solution to this system, what is the value of z?
15 points!

−3x+y+z=−1

2x+y−z=−4

x−y+z=7

Asalesperson earns $320 per week plus 8% of her weekly sales. the expression representing her earnings is 320 + 0.08x. which of the following describes the sales necessary for the salesperson to earn at least $1000 in the one week?

The probability that an adult possesses a credit card is .70. a researcher selects two adults at random. by assuming the independence, the probability that the first adult possesses a credit card and the second adult does not possess a credit card is:

Write the equation in logarithmic form e^x=403.429