Gillian purchased 25 books at the library book sale. Each hardcover book cost $1.50, and each paperback book cost $0.50. Gillian
2 answers:
Answer:
Number of books did Gillian buy is 11.
Step-by-step explanation:
Given : Gillian purchased 25 books at the library book sale. Each hardcover book cost $1.50, and each paperback book cost $0.50. Gillian spent a total of $26.50.
To find : How many paperback books did Gillian buy?
Solution :
The book costs can be represented by the system of equations below.
......(1)
......(2)
Solving the system of equations by substitution method
Substitute h=25-p from (1) into (2)
Substitute back in equation (1),
i.e. there are 11 paperback books and 14 hardcover books.
Therefore, Number of books did Gillian buy is 11.
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Answer:
, 8cm, are both options
Step-by-step explanation:
For a right triangle one can find the length of the longest side by using the Pythagorean theorem. So there are two options I can think of that if the triangle is a right triangle will work. First remember what the Pythagorean theorem is : side a^2+side b^2=hypotenuse^2
The hypotenuse is the longest side of a right triangle. So if the sides that are 15 and 17 cm are not the longest sides then the formula would be:
But if 17cm is the longest side then:
Hope this helps!