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3 years ago

Elena drove 245 miles last week and 222 miles this week she estimate that she drove about 475 miles in weeks.how Elena estimate

Mathematics

2 answers:

zimovet [89]3 years ago

7 0

Answer:

She estimated by rounding 245 to nearest tens and rounding 222 to nearest five.

Step-by-step explanation:

Given,

The miles she drove last week = 245

Since, 245 ≈ 250 ( because the ones place digit is 5 that is we will round up )

Also, the miles she drove this week = 222,

∵ The nearest 5 of 222 is 225,

Thus, the total miles she drove = 245 + 222 ≈ 250 + 225 = 475 miles

Alona [7]3 years ago

4 0

Round each number then add

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Hoochie [10]

Answer:

15x + 15

Step-by-step explanation:

Combine like terms. Like terms are terms with the same amount of variables. Set the equation so that the terms are grouped:

6x + 9x + 6 + 9

Combine like terms:

(6x + 9x) = 15x

(6 + 9) = 15

15x + 15 is your answer.

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Felicia is solving the expression - 5(3x + 2) + 10x. Gregory is solving the expression -12 - 4x +?+?x.

IrinaK [193]

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3 years ago

The distance on a city grid is measured in blocks. On the grid, the coordinates for the location of your house are (2,6). The In

dolphi86 [110]

The answer is C) 16 blocks.

We will use the distance formula for this problem:

$d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

From your house to the internet cafe:

$d=\sqrt{(8-6)^2+(12-2)^2}=\sqrt{2^2+10^2}=\sqrt{4+100}
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From the internet cafe to your friend's house:
$d=\sqrt{(8-4)^2+(12-8)^2}=\sqrt{4^2+4^2}=\sqrt{16+16}=\sqrt{32}=5.7$

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3 years ago

If a cot α = 1 and b cos α = 1, find a2 – b 2

S_A_V [24]

The equivalent expression of the different of two square is -1

Given the following expressions

a cot α = 1

a = 1/cot α = sinα/cosα

b = 1/cos α

We are to find the expression a² - b²

According to difference of two squares;

a² - b² = (a + b) (a - b)

Substitute the given expressions into the formula as shown:

$a^2 - b^2 = (\frac{sin \alpha}{cos \alpha} )^2 - (\frac{1}{cos \alpha} )^2\\a^2 - b^2=\frac{sin^2 \alpha}{cos^2 \alpha} -\frac{1}{cos ^2 \alpha}\\a^2 - b^2=\frac{sin^2 \alpha-1}{cos^2\alpha}\\a^2 - b^2=\frac{-(1-sin^2\alpha)}{cos^2\alpha} \\a^2 - b^2=\frac{-os^2 \alpha}{cos^2 \alpha}\\a^2 - b^2 = -1$

This shows that the equivalent expression of the difference of two squares is -1

Learn more here: brainly.com/question/11084694

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2 years ago