Answer:
Mary's sister is 12 years old.
Step-by-step explanation:
If Mary is half of her sister's age, her sister is 2 times her age.
Represent M as Mary's age...
M+2m=18
3m=18
3m/3=18/3
m=6
But because Mary is a half of her sister's age...
6*2=12
If you are giving a line that crosses 2 parallel lines, angle 3, 4 and 5 are 52.6 as well because they are all complementary to each other, and angles 1, 2, 7 and 8 are all 127.4 degrees because 180 degrees from one side to the other on the line minus 52.6 from the other side leaves 127.4 degrees in the other angles.
Answer:
d
Step-by-step explanation:
Answer: In terms of percent, the salinity of most sea water is between 2.5 and 4.5
Step-by-step explanation: