Let the number of text messages be represented by X.
Then the total cost of David's cell phone adds up to

Since the total cost of David's phone equals $91.40, we get the following equation.

Subtract 50 on both sides

Divide both sides by 0.45

Therefore David has send 92 text messages.
I'm pretty sure the answer is G. I'm not 100% sure tho. Hope this helps! :)
Answer:
8/9
Step-by-step explanation:
Answer:
Hi
Step-by-step explanation:
Olá boa tarde meu nome é "Guilherme" sou de Brasil e vou resolver a sua pergunta
a ) 2x - 2y = 12
{ a 2
{ b 2
{ c 12
<u>/</u><u>\</u> = b elevado 2 -4 a.c
<u>/</u><u>\</u> = (2) elevado 2 -4 . 24
<u>/</u><u>\</u> = 4 -4 . 24
<u>/</u><u>\</u> = 24
X = <u>-</u><u>b</u><u>+</u><u>/</u><u> </u><u>/</u><u>\</u><u> </u> = <u> </u><u>2</u><u> </u><u>-</u><u> </u><u>5</u>
2a 2
<u> </u><u>5</u>
2
<u> </u><u>5</u>
2
S = {20,10}
b) 29. - 3y = -2
{ a = 29
{ b = -3
{ c = -2
<u>/</u><u>\</u> = b elevado 2 -4 a.c
<u>/</u><u>\</u> = (-6) -4 . 58
<u>/</u><u>\</u> = -10 . 58
<u>/</u><u>\</u> = -48
X = <u> </u><u>b</u><u> </u><u>+</u><u> </u><u>/</u><u> </u><u>/</u><u>\</u><u> </u> = <u> </u><u>-</u><u>3</u><u> </u><u>+</u><u> </u><u>24</u><u> </u>
<u> </u><u>5</u>
3
<u> </u><u>5</u>
3
S = { 15,15}
Espero ter ajudado
2a 2