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SCORPION-xisa [38]
3 years ago
8

I need help with 1 2 3 & 4 please help

Mathematics
1 answer:
Tatiana [17]3 years ago
7 0
I cant read that if you can make it a bit  clear then i can read it


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It is given that A is directly proportional to r2 and r> 0. When r=5, A=75.
torisob [31]

Answer:

see explanation

Step-by-step explanation:

Given A is directly proportional to r² then the equation relating them is

A = kr² ← k is the constant of proportion

To find k use the condition when r = 5, A = 75 , then

75 = k × 5² = 25k ( divide both sides by 25 )

3 = k

A = 3r² ← equation of proportion

(a)

when r = 4, then

A = 3 × 4² = 3 × 16 = 48

(b)

when A = 147 , then

147 = 3r² ( divide both sides by 3 )

49 = r² ( take the square root of both sides )

r = \sqrt{49} = 7

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3 years ago
Find the x - and y-intercepts of the graph of the linear equation –6x + 9y = -18
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Answer:

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Step-by-step explanation:

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3 years ago
Evaluate the derivative of the given function for the given value of x. Yequalsstartfraction 3 x minus 6 over 4 x plus 5 endfrac
geniusboy [140]

no rurio greob tryo yeu

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3 years ago
Marcia spent $11.07 for 4.5 pounds of apples. What was the cost per pound (for one pound)?
atroni [7]

The cost per pound was roughly $0.41.

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X2 + 14x + 7 = 9x + 3<br> x =<br> or x =
Vinvika [58]

Answer:

x= -1  or  x= -4

Step-by-step explanation:

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