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alexira [117]
3 years ago
12

20% off of a $81 bicycle

Mathematics
2 answers:
mrs_skeptik [129]3 years ago
8 0
The sale price for this bicycle after 20% of is $64.80. Hope it help!
Liula [17]3 years ago
4 0
Hi

The new price of the bicycle is $64.80 .

10%=8.1
20%=16.2

81-16.2=64.8
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9.8 ÷ 7 = 1.4

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"the expression 200s + 10c shows the amount of calories in "s" (slices of pizza) and "c"(number of carrot sticks" how many calor
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Pls help ILL MARK BRAINLIEST
kozerog [31]

<u>Answer:</u>

a) Height of the ledge is 1.6 m.

b) roots of the equation are: \bf d = 2 ,  \bf d = -1

c) Maximum height reached = 1.8 m.

<u>Step-by-step explanation:</u>

a) The height of the ledge is the same as the height at which Jake is when he hasn't moved any horizontal distance from the ledge yet, that is, when d = 0:

h = -0.8(0)^2 + 0.8(0) + 1.6

⇒ \bf h = 1.6 \space\ m

∴ Height of the ledge is 1.6 m.

b) The x-intercepts occur where y = 0, that is when h = 0:

-0.8d^2 + 0.8d + 1.6 = 0

Divide both sides of the equation by -0.8:

d^2 - d -2 = 0

Factorizing:

⇒ d^2 -2d + d - 2 = 0

⇒ d(d-2) +1 (d-2) = 0

⇒ (d-2)(d+1) = 0

⇒ d - 2 = 0    or    d + 1 = 0

∴ roots are :  \bf d = 2   ,   \bf d = -1

c) To find the maximum value of a quadratic equation in the form

y = ax² + bx + c , use the formula:

max = c - (b² / 4a).

Using the formula for h = -0.8x^2 + 0.8x + 1.6 :

max <em>h </em>=  1.6 - ( \frac{0.8^2}{4(-0.8)} )

       = 1.8

∴ Maximum height reached = 1.8 m.

7 0
2 years ago
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