Answer:
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Step-by-step explanation:
Answer:
14 books
Step-by-step explanation:
Let b = number of books at the beginning
She sold 1/2 of the books
b - 1/2 b
This is how many she had left
Then she bought 7
b - 1/2 b + 7
this equals 14
b - 1/2 b + 7 = 14
Combine like terms
1/2 b + 7 = 14
Subtract 7 from each side
1/2 b = 14-7
1/2 b = 7
Multiply each side by 2
1/2 b * 2 = 7*2
b = 14
She started with 14 books
Answer:
Beginner. Use a paper strip coated in a pH indicating dye. Dip the strip into the water and wait for the strip to change color. ...
Intermediate. Use a pH testing kit for liquids. ...
Advanced. A digital pH meter can be used to obtain the most accurate reading of the pH level.
Step-by-step explanation:
I = prt
t = I/pr = 105/(700 x 0.05) = 105/35 = 3
Therefore, t = 3.
