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3 years ago

10

Macy needs to double the number 439. What addition problem can she use?

1 answer:

Cerrena [4.2K]3 years ago

8 0

439+439 is the same as doubling (439x2)

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Here is an expression: 2 + 3t

Dima020 [189]

2+3t
When t is 1
2+3(1)
2+3
5

When t is 4
2+3(4)
2+12
14

3 0

3 years ago

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Can someone please help

jolli1 [7]

Powers shared by the state and federal government are known as concurrent powers.

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3 years ago

Bens shape covered 20 square centermiters what would be the shapes total area if another 10 square centermiters were added

Nookie1986 [14]

10+20 =30 so the answer is 30 square centimeters

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3 years ago

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Need some help, kinda stuck

ElenaW [278]

Answer:

7/4

Step-by-step explanation:

$\displaystyle\frac{2 + \sqrt{ - 3} }{2} ( \frac{2 - \sqrt{ - 3} }{2} )~~~~~~$

Evaluate.

Solution:

Rewrite it as,

$\displaystyle\frac{2 + \sqrt{ - 1 } \sqrt{ 3} }{2} ( \frac{2 - \sqrt{ - 1} \sqrt{3} }{2} )$
$\displaystyle\frac{2 + i\sqrt{ 3} }{2} ( \frac{2 - i\sqrt{ 3} }{2} )~~~~~~$

Multiplying them,

$\displaystyle\frac{(2 + i\sqrt{ 3})\times(2 - i \sqrt{3}) }{2 \times 2}$

$\displaystyle\frac{(2 + i\sqrt{ 3})\times(2 - i \sqrt{3}) }{4}$

Applying Distributive property,

$\displaystyle\frac{2(2 + i\sqrt{ 3}) + \: i \sqrt{3} (2 - i \sqrt{3}) }{4}$

$\cfrac{2 \times 2 + 2( - i \sqrt{3} ) + i \sqrt{3}(2 - i \sqrt{3} ) }{4}$

$\cfrac{2 \times 2 + 2( - i \sqrt{3}) + i \sqrt{3} \times 2 + i \sqrt{3} ( - i \sqrt{3}) }{4}$

Combining each terms,

$\cfrac{4 - 2i \sqrt{3} + 2i \sqrt{3} + 3}{4}$
$\cfrac{ - 2i \sqrt{3} + 2i \sqrt{3} + 7 }{4}$
$\boxed{\cfrac{ 7}{4} }$

Last Choice is accurate.

7 0

2 years ago

Read 2 more answers

SSSSS [86.1K]

Answer:

um

Step-by-step explanation:

5 0

3 years ago