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just olya [345]
2 years ago
10

Write the percent as a decimal. 1. 66.7%

Mathematics
2 answers:
Sever21 [200]2 years ago
7 0

Answer:

66.7% = 0.667 in decimal form.

Hope that helps!

juin [17]2 years ago
5 0

Answer:

0.667

Step-by-step explanation:

Percentages can be changed to decimals by dividing by 100 (or moving the decimal left two places).

Decimals can be changed to percentages by multiplying by 100 (or moving the decimal right two places).

Because 66.7% is a percentage (and we're converting to a decimal), we divide by 100 and move the decimal left two places so it becomes 0.667.

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Solve for the roots in simplest form by completing the square <br><br> x^2-12x+20=0
Alex17521 [72]

Answer:

x = 10 or x = 2

Step-by-step explanation:

Solve for x:

x^2 - 12 x + 20 = 0

Hint: | Solve the quadratic equation by completing the square.

Subtract 20 from both sides:

x^2 - 12 x = -20

Hint: | Take one half of the coefficient of x and square it, then add it to both sides.

Add 36 to both sides:

x^2 - 12 x + 36 = 16

Hint: | Factor the left hand side.

Write the left hand side as a square:

(x - 6)^2 = 16

Hint: | Eliminate the exponent on the left hand side.

Take the square root of both sides:

x - 6 = 4 or x - 6 = -4

Hint: | Look at the first equation: Solve for x.

Add 6 to both sides:

x = 10 or x - 6 = -4

Hint: | Look at the second equation: Solve for x.

Add 6 to both sides:

Answer: x = 10 or x = 2

5 0
2 years ago
HELP 7TH GRADE I WILL GIVE BRAINLIEST
Feliz [49]

Answer:

a

Step-by-step explanation:

theres a 90 degree angle and a has a 95 so thats pretty close

5 0
2 years ago
Type of Ball football basketball baseball softball
crimeas [40]

Answer:

1.-  He received 388 dollars in exchange.

2.-(100 x 4) - (7.00 + 5.00)

= 400 - 12

= 488

3.-  I buy 15 basketballs.

And I buy 6 soccer balls.

4.-  (135 ÷ 9) (48 ÷ 8)

= 15, 6

Step-by-step explanation:

I hope I have helped you can you put that this is the smartest answer please?

5 0
2 years ago
In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped
pickupchik [31]

Answer:

The population standard deviation is not known.

90% Confidence interval by T₁₀-distribution: (38.3, 53.7).

Step-by-step explanation:

The "standard deviation" of $14 comes from a survey. In other words, the true population standard deviation is not known, and the $14 here is an estimate. Thus, find the confidence interval with the Student t-distribution. The sample size is 11. The degree of freedom is thus 11 - 1 = 10.

Start by finding 1/2 the width of this confidence interval. The confidence level of this interval is 90%. In other words, the area under the bell curve within this interval is 0.90. However, this curve is symmetric. As a result,

  • The area to the left of the lower end of the interval shall be 1/2 \cdot (1 - 0.90)= 0.05.
  • The area to the left of the upper end of the interval shall be 0.05 + 0.90 = 0.95.

Look up the t-score of the upper end on an inverse t-table. Focus on the entry with

  • a degree of freedom of 10, and
  • a cumulative probability of 0.95.

t \approx 1.812.

This value can also be found with technology.

The formula for 1/2 the width of a confidence interval where standard deviation is unknown (only an estimate) is:

\displaystyle t \cdot \frac{s_{n-1}}{\sqrt{n}},

where

  • t is the t-score at the upper end of the interval,
  • s_{n-1} is the unbiased estimate for the standard deviation, and
  • n is the sample size.

For this confidence interval:

  • t \approx 1.812,
  • s_{n-1} = 14, and
  • n = 11.

Hence the width of the 90% confidence interval is

\displaystyle 1.812 \times \frac{14}{\sqrt{10}} \approx 7.65.

The confidence interval is centered at the unbiased estimate of the population mean. The 90% confidence interval will be approximately:

(38.3, 53.7).

5 0
2 years ago
Please help <br><br> This is a true or false question i’m just not smart
fiasKO [112]
It’s true i’m pretty sure
7 0
3 years ago
Read 2 more answers
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