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3 years ago

Which of the following is the same as 8.4 × 10 to the second power?

Mathematics

2 answers:

Bess [88]3 years ago

4 0

I believe the answer would be C.) 840

stich3 [128]3 years ago

3 0

1) $8.4 \times 10^{2}$ is the same as $8.4 \times 100$ because the order of operations state to perform the exponents before multiplication.
$8.4 \times 100 = 840$

The answer is C) 840

2) I'm assuming the second thing you said was a typo, but 8.4 × 10*2 is the same as 8.4 x 20, for the same reason above. 8.4 x 20 = 168.

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-5(4x-2)=-2(3+6x) multi step equation

Oliga [24]

Answer:

X=2, please mark me brainliest

Step-by-step explanation:

−5(4x−2)=−2(3+6x)

(−5)(4x)+(−5)(−2)=(−2)(3)+(−2)(6x)(Distribute)

−20x+10=−6+−12x

−20x+10=−12x−6

Step 2: Add 12x to both sides.

−20x+10+12x=−12x−6+12x

−8x+10=−6

Step 3: Subtract 10 from both sides.

−8x+10−10=−6−10

−8x=−16

Step 4: Divide both sides by -8.

−8x

−8

−16

−8

x=2

4 0

3 years ago

Josh bought 2 pairs of jeans for $25.60 each and some shirts for $15.30 each. If he spent a total of $112.40,

mojhsa [17]

Answer:

5 shirts

Step-by-step explanation:

2 pairs of jeans $25.60

$112.40-$25.60=$86.80

if each pair of T-shirts cost $15.30

$15.30 times 5=$76.50

$86.80 - $76.50=$10.30

so John bought 5 shirts however he got some many left $10.30

5 0

2 years ago

Who can do my online work ?

Ludmilka [50]

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3 years ago

Which of the following expressions is equivalent to 13^(2)-3^(2)

Amiraneli [1.4K]

Answer:

160

Step-by-step explanation:

13² - 3² = 13 × 13 - 3 × 3 = 169 - 9 = 160

8 0

2 years ago

How Important Is Regular Exercise? In a recent poll1 of 1000 American adults, the number saying that exercise is an important pa

Elza [17]

Answer:

Step-by-step explanation:

Given that in a recent poll 1 of 1000 American adults, the number saying that exercise is an important part of daily life was 753.

Sample proportion = $\frac{753}{1000} =0.753$

To find 90% confidence interval we must find std error of proportion first

As per central limit theorem, sample proportion will follow a normal distribution with mean = 0.753

Std error of proportion= $\sqrt{0.753*0.247/1000} \\=0.01363$

90% Z critical value = 1.645

Margin of error = 1.645*0.01363 = 0.0224

Confidence interval lower bound = 0.753-0.0224=0.731

Upper bound = 0.775

6 0

3 years ago