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kramer
3 years ago
6

What is the value of the expression? 8.5 - (-4.8) - 7

Mathematics
1 answer:
marysya [2.9K]3 years ago
5 0

Answer:

6.3

Step-by-step explanation:

8.5 - (-4.8)

Let's focus on - (-4.8)

if a negative number is subtracted, it reverses itself

In other words, if a negative number is being subtracted, it is the same as being added as a positive number

So we change the equation to

8.5 + 4.8 = 13.3

Now we subtract 7 from 13.3

Since positive 7 is being subtracted, the rule for -4.8 does not apply to it

13.3 - 7 = 6.3

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Answer: h(x)=10(0.4)^x

Step-by-step explanation:

The exponential function h, represented in the table, can be written as h(x)=ab^x

From table, at x=0, h(x) =10

Put theses values in equation,, we get

10=a.b^0\\\\\Rightarrow\ 10=  a (1)\\\\\Rightarrow\ a= 10

Also, for x= 1 , h(x) = 4, so put these values and a=10 in the equation , we get

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-2x³ + x² - 3x - 15

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