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Afina-wow [57]
3 years ago
12

Neil bought 5 books. The average price of 2 books is 5 dollars. The average price of the rest of the books is 4 dollars. Find th

e total amount of money Neil paid for the 5 books
Mathematics
1 answer:
Eduardwww [97]3 years ago
7 0
2 of the books= $5
1 of the books= $4
5-2=3
3*4=12
12+5=$17 
17 dollars Neil paid.
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Answer:

Base = 32 cm

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Step-by-step explanation:

Area of a triangle can be calculated as:

Area = \frac{1}{2}\times Base \times Height

We are given that the base of triangle exceeds the height by 7 cm. This can be expressed in an equation form as:

Base = Height + 7

Lets use B to represent base and H to represent height

B = H + 7

The equation of area can be stated as:

Area=\frac{1}{2}bh\\\\ Area=\frac{1}{2}(h+7)(h)\\\\ 400=\frac{1}{2}h(h+7)\\\\ 800=h^{2}+7h\\\\ h^{2}+7h-800=0

This is a quadratic equation which can be solved using a quadratic equation as shown below:

h=\frac{-7+-\sqrt{49-4(1)(-800)} }{2(1)} \\\\ h=\frac{-7+-57}{2}\\\\h=-32,25

Since the height cannot be negative, we'll consider the positive value only i.e height is equal to 25 cm.

Therefore, the length of base will be 25 + 7 = 32 cm.

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3 years ago
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Step-by-step explanation:

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EXPLANATION

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