Using the substitution method Ken solves the following system of equations algebraically 2x-y=5
3x+2y=-3

which equivalent equation could ken us

a 3x+2 (2x-5)=-3)
b 3 (y+5/2) +2y=-3
c 3+2( 5-2x)=-3
d 3 5/2-y) +2y=-3

Jude is making cement for a driveway. the instructions show the amount of each ingredient to make 1 batch of cement. complete each statement to adjust the ingredients for each new situation if jude uses these instructions.

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?

Shirley spelled 12 of her 15 spelling words correctly on the test. what percentage did shirley get on the test?