3. Select all equations that can result from adding or subtracting these 2 equations: 5x+y = 12
3x - 5y = 4

a. -2x-4y=8
b. -2x+6y=8
c. 4x-4y=16
d. 4x+4y=16
e. 2x-6y=-8
f. 5x-4y=28

Step-by-step explanation:

ekshd

24

step-by-step explanation:

the graph shows 30% of students walk. 80 students were questioned, so the number that said they walk is

30% × 80 = 0.30 × 80 = 24

answer:   35 % is the probability of a late departure or an early arrival.

step-by-step explanation:

let l represents the late departure and e represents the early departure.

then, according to the question,

p(l) = 12 %,   p(e) = 27 % and = 4 %

and, we have to find out,

but, we know that,

which is the required equation that will use to find the probability of a late departure or an early departure.

therefore,   the probability of a late departure or an early arrival =   35 %