3 years ago

Tim’s mathematics teacher asked him to explain the expression −8 · 7. Which answer should Tim give?

Mathematics

2 answers:

julia-pushkina [17]3 years ago

8 0

Answer:

-56

Step-by-step explanation:

olasank [31]3 years ago

4 0

-56 A negative Multiplied by a Positive is a Negative

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erastovalidia [21]

3x = x + 24

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x = 12

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A student found the product of 6 x 10^5 and 5 x 10^6 to be 3 x 10^11. What is the error? What is the correct product? Complete t

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3 years ago

Prove that the value of the expression does not depend on the variable x:

Leviafan [203]

Answer:

See below

Step-by-step explanation:

If an expression is not dependent on x, it simplified form must not contain x. To show that this is the case for (a) and (b) we need to simplify them and assess:

(a)

$(x-5)(x+8)-(x+4)(x-1)=\\=x^2-5x+8x-40-x^2-4x+x+4=-36$

Indeed, does not depend on x!

And (b)

$x^4-(x^2-1)(x^2+1)=x^4-x^4+x^2-x^2+1=1$

Again, does not depend on x.

8 0

3 years ago