3 years ago

Simplify the expression. Write the answer using scientific notation.

Mathematics

1 answer:

tiny-mole [99]3 years ago

3 0

$9 \times {10}^{5} \times 3 \times {10}^{10} = 27 \times {10}^{15} = 2.7 \times {10}^{16}$

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Subtract 2x^2-3xy+4y^2 from 3x^2-5xy-6y^2

Diano4ka-milaya [45]

Answer:

$-x^{2} +2xy+10y^{2}$

Step-by-step explanation:

$2x^2-3xy+4y^2-(3x^2-5xy-6y^2)\\2x^2-3xy+4y^2-3x^2+5xy+6y^2\\-x^{2} +2xy+10y^{2}$

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3 years ago

Kevin is twice as old as Sean. Together their ages add up to 75.

marissa [1.9K]

Answer:

Kevin would be 50 and Sean would be 25

Step-by-step explanation:

Assuming that there is no other information given,

and Kevin is twice as old as sean, and they gotta add up to 75 total

50 + 25 = 75

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Hope this helped!

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3 years ago

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vichka [17]

It will take 9 days. 269 x 9 = 2,421

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3 years ago

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Chris bought "c" tickets to a movie for $9 each. Michael bought " m" tickets to another movie for $10 each. Write an expression

Fynjy0 [20]

<u>Answer:</u>

9c + 10 (see below)

<u>Step-by-step explanation:</u>

To find how much Chris spent on tickets, you can write an expression to represent the situation:

$9c

You can do this to find how much Michael spent as well:

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To find how much Chris and Michael spent combined, add their two costs:

9c + 10

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3 years ago

What number can go in the box to make the number sentence true?

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I believe it would be 4 lil man

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