WILL GIVE BRAINLIEST. Lizzy’s cell phone plan charges 5 cents per message for in-network text messages and 10 cents per message for out-of-network text messages. If she sent a total of 1500 messages and her bill was $80, how many out-of-network messages did she send?

in-network texts = 1400

out-of-networks texts = 100

Step-by-step explanation:

a=in-network text

b=out-of-network text

a+b=1500

a=-b+1500

since we know that a=-b+1500, we substitute that into

0.05a+0.1b=80

so that it is

0.05(-b+1500)+0.1b=80

0.05b+75=80

b=100

since b=100, we substitute that into

a+b=1500

so that it's

a+100=1500

a=1500-100

a=1400

b=100

hope this helps

an advantage of the standard deviation is that it increases as the dispersion of the data increases. e. the interquartile range is preferred when the data are not skewed or no have outliers. an advantage of the standard deviation is that it uses all the observations in its computation.