Mark is solving the following system (1)
X+ y + z = 2
3x+2y + Z = 8
4x-y-73= 16
(2)
(3)
Step 1: He multiplies equation (1) by 7 and adds it to equation (3)
Step 2: He multiplies equation (3) by 2 and adds it to equation (2)
Which statement explains Mark's mistake?

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72

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.

4y - 6 + y^2 - 9 = y^2 + 4y - 15

y^2 term

terms

- terms

total of 3 terms when simplified

step-by-step explanation: