I'm a little confused on how to solve this, can anybody ? solve the following system of equations and show all work. y = x^2 + 3 y = x + 5

7x+8y=-18, 4x-9y=-3 solve the system of equations

Find the value of x. give reasons to justify your solutions! c ∈ ae

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.