Anna can text much faster than her mother, joanna. on average, it takes joanna two minutes to send a text; on average, anna takes 40 seconds to send a text. how long will it take the two of them to send a total of 84 texts if they start texting at the same time?

42 min

Step-by-step explanation:

Joanna takes 2 mins to send a text.

2 mins = 2 x 60 sec = 120 sec

Anna takes 40 seconds to send a text

120 ÷ 40 = 3

Anna can text 3 messages in 120 sec

Together, in 120 sec ,

both of them can send out 1 + 3 = 4 texts

Number of 120 seconds needed to send 84 texts

= 84 ÷ 4

= 21

Number of seconds needed

= 21 x 120

= 2520

25020 sec = 2620 ÷ 60 min = 42 min

correct answer is infinitely many solutions

step-by-step explanation:

2(2x + 3) = -4 + 2(2x + 5)

solving the above equation:

4x + 6 = -4 +4x +10

combining like terms

4x -4x = -4+10-6

0=0

since both sides are 0=0, we end up into true statement it means it has infinite many solutions.

so correct answer is infinitely many solutions

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.