Equation 1: 4x-2y=4 Equation 2: 2x+y=6

Anna is solving the given system by the elimination method. Her strategy is to solve for y, then x. Which step should Anna take first?
1
A) Multiply Equation 2 by 1/2
B) Multiply Equation 2 by - 1.
C) Multiply Equation 2 by 2.
D) Multiply Equation 2 by-2.

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?