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OverLord2011 [107]
3 years ago
5

I need help with math here the photos

Mathematics
1 answer:
arsen [322]3 years ago
4 0

Answer:

9-49

a=  2r+ 7

b= 2.5x + 16

c= 3r-2x-8.8

Step-by-step explanation:

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Fraction equivalent to 0.0368
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If gasoline sells for $1.25 per gallon, how much would 3 3/5 gallons cost? express your answer as a decimal
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Please help worth 25 points
wariber [46]

Answer:

h=6 feet

Step-by-step explanation:

Given: 1. The base of a rectangle is three feet longer than its height.

2.Are of the rectangle=54 square meters

Let us say the rectangle has height h and base(breadth) b.

Since, the base of the rectangle is three feet longer than the height, we have b=h+3.

Also, Area of the Rectangle= hb

therefore, 54=h(h+3)

54= h2+ 3h

h2+3h-54=0 (Subtract 54 from both the sides)

To find the value of h we have to solve the quadratic equation.

[We have the equation in the form ax2+bx+c=0, to factorise the equation-

Step1. Find two numbers such that their multiplication is equal to ac and their addition is equal to b.

Step2. Replace b with these numbers.

Step3. Simplify the equation]

So, h2+3h-54=0

h2+9h-6h-54=0

h(h+9)-6(h+9)=0

(h+9)(h-6)=0

Which gives-

h= -9 or h= 6

As h is the height of the rectangle, h can not be -9.

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So the dimensions of the rectangle are 6 feet for the height and 9 feet for the base.

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