The dot plots below show the ages of students belonging to two groups of music classes:

a dot plot shows two divisions labeled group a and group b. the horizontal axis is labeled as age of music students in years. group a shows 5 dots at 6, 5 dots at 8, 3 dots at 9, 7 dots at 11, and 5 dots at 13. group b shows 2 dots at 6, 4 dots at 10, 4 dots at 13, 3 dots at 15, 5 dots at 16, 4 dots at 19, and 3 dots at 21.

based on visual inspection, which group most likely has a lower mean age of music students? explain your answer using two or three sentences. make sure to use facts to support your answer.

1) c 2143.6 cm

2) c 113.0 m

3) a 33.5 ft

4)   d 2 cm

5) c 20 mm

6) 180 in

7) d 120 ft

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step-by-step explanation:

answer: an 8-foot rope is tied from the top of a pole to a

stake in the ground, as shown in the diagram

below

step-by-step explanation:

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 -