1. State the number and type (rational/irrational) of real solutions by using only the discriminant.
Justify your answer. (2 points each)
a. 2x? – x + 5 = 0
b. 3x2 = 5x + 12
2. Solve the quadratic equation, if possible, by using the quadratic formula. Write your answer in
simplest terms. (4 points)
7x2 + 10x - 1 = 0

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%

a c

step-by-step explanation:

answer: - (a)

(b) 88 seats

step-by-step explanation:

given: in an auditorium, there are 22 seats in the first row and 28 seats in the second row.

thus first term=

second term=

the number of seats in a row continues to increase by 6 with each additional row.

⇒d= 6

a) given formula :

b)   let the number of seats (n) = 12

substitute n=12 in the explicit rule formed in (a)

∴there are 88 seats in 12 rows.