60% of the teachers completed the last survey sent out from the school. If 30 teachers completed the survey, how many total teachers are at the school?

50

Step-by-step explanation:

Let the number of teachers is t.

60% of t is 30

0.6t = 30

t = 30/0.6

t = 50

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

the answer is 15.50 for one mile

b) is slope: 0   y- intercept 15.5