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Maurinko [17]
3 years ago
8

Solve for the variable 7/28 = 25/?

Mathematics
1 answer:
ICE Princess25 [194]3 years ago
7 0
Let x be the unknown number. The equation is going to be 7/28=25/x, now we cross multiply. 7*x=25*28, 7x=700, divide both sides by 7 and you should get 100, So, x=100 and 7/28=25/100
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How many solutions does the equation x^2-9x=-8 have?
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X^2-9x=-8
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x-8=0
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x=8

x-1=0
x-1+1=0+1
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There are 2 solutions, which are 1 and 8 
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1 year ago
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7 0
3 years ago
How do I solve part b?
Minchanka [31]

Answer:

x \approx 1.4

Step-by-step explanation:

This problem gives one the following equation to model the graph of a line: (y=x^2-2). The problem asks one to find the value of (x) when (y=0). Rather than using the graph, an easier way to solve this problem is to substitute (0) in for the value of (y) and then solve for (x) using inverse operations.

y=x^2-2\\

Substitute,

0=x^2-2

Inverse operations,

0=x^2-2\\\\2=x^2\\\\\sqrt{2}=x

Round:

x \approx 1.4

As one can see on the graph, this result is very close to the value at which the graph intersects the (x) axis. Thus, one can conclude that (x) does indeed approximately equal (1.4)

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Step-by-step explanation:

6 0
1 year ago
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