Factorize the following a) x^2-720b) 15xy+15+9y+25x
2 answers:
Answer:
see explanation
Step-by-step explanation:
(a)
Expressing as a difference of squares
a² - b² = (a - b)(a + b), thus
x² - 720
= x² - (12 )²
= (x - 12 )(x + 12
)
(b)
15xy + 15 + 9y + 25x ← rearrange
= 15xy + 9y + 25x + 15 ( factor the first/second and third/fourth terms )
= 3y(5x + 3) + 5(5x + 3) ← factor out (5x + 3)
= (5x + 3)(3y + 5) ← in factored form
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Answer:
It will take her 3 hours to read 120 pages.
Step-by-step explanation:
The number of pages read(y) after x hour can be modeled by a linear function in the following format:
In which a is the number of pages read per hour and b is the initial number of pages read.
A straight line goes through (0, 0)
This means that when
So
(0.5, 20)
When
So
The function in:
According to the graph, which statement must be true?
It will take her 2 hours to read 60 pages.
Less than 2 hours for 60 pages, so this is false.
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This statement is true.
It will take her 4 hours to read 180 pages.
More than 4 hours to read 180 pages. So false.
It will take her 5 hours to read 210 pages.
More than 5 hours to read 210 pages. So false.