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3 years ago

12

A student answered 86 problems on a test correctly and receives a grade at 98% how many problems were only test if all the probl

ems were worth the same number of points( round to the nearest whole number)

1 answer:

love history [14]3 years ago

5 0

Answer:

88 questions

Step-by-step explanation:

86/0.98 = 87.755

pls mark brainliest :D

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2^2x+2 *5^x-1=8^x*5^2x

Liula [17]

Answer:

The solution will be "x = 2 and x = -1".

Step-by-step explanation:

The given equation is:

⇒ $2^{2x+2}\times 5^{x-1}=8^x\times 5^{2x}$

On solving " $8^x$ ", we get

⇒ $2^{2x+2}\times 5^{x-1}=(2^3)^x\times 5^{2x}$

As we know, if the base are same then their powers will be added together.

⇒ $2x+2=3x$ ...(equation 1)

⇒ $x-1=2x$ ...(equation 2)

From equation 1, we get

⇒ $2=3x-2x$

⇒ $2=x \ i.e., x =2$

From equation 2, we get

⇒ $-1=2x-x$

⇒ $-1=x \ i.e., x=-1$

So that the correct answer will be "x = 2" and "x = -1".

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Step-by-step explanation:

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