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3 years ago

Write these numbers in standard notation 3.05 x 10–3

Mathematics

1 answer:

My name is Ann [436]3 years ago

6 0

- I think if it was standard notation then it would be 3.05 * 10 = 30.5 - 3 = 27.5.

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In a high school, 7% of the students play the piano. This is 21 students. Choose the expressions that complete each step involve

Gnesinka [82]

Hello,

Set up a proportion :

7 → 21

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Cross multiply :

100 * 21 / 7 = 300 students

Bye :)

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3 years ago

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2 years ago

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2 years ago

The expression 9x2 - 5x - 7 has ___ terms and a constant of ___.

lukranit [14]

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2 years ago

Read 2 more answers

Answers for the 2 boxes please:)

masha68 [24]

Answer:

(5,-5)

Step-by-step explanation:

Eliminate y-term

$(2x + 5x) + ( - 3y + 3y) = 25 + 10 \\ 7x = 35 \\ x = \frac{35}{7} \\ x = 5$

We can eliminate x-term but for this system of equations, eliminating y-term is faster.

Substitute x = 5 in any given equations.

I will choose to substitute in the first equation.

$2x - 3y = 25 \\ 2(5) - 3y = 25 \\ 10 - 3y = 25 \\ 10 - 25 = 3y \\ - 1 5 = 3y \\ 3y = - 15 \\ y = - 5$

Answer Check

Substitute both x-value and y-value in any given equations

$2x - 3y = 25 \\ 2(5) - 3( - 5) = 25 \\ 10 + 15 = 25 \\ 25 = 25$

The equation is true. (It is better to check both the answer for both equation.)

Thus the answer is (5,-5)

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2 years ago