(Number 4)help...plzz

-2x + 10 +4x=70 (what is X?)

Dovator [93]

Answer:

x = 30

Step-by-step explanation:

-2x + 10 +4x=70

-10 -10

-2x + 4x = 60

2x = 60

/2 /2

x = 30

8 0

3 years ago

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The question is Chan filled his car with 12.85 gallons of gas the next week he filled his car with 9.08 gallons of gas how much

Shkiper50 [21]

Answer:

3.77

Step-by-step explanation:

Do 13.85-9.08 and

u get 3.77

4 0

3 years ago

Find f(5) if f(t) = ^6 – 3t – 4.<br> A –6 <br> B –2 <br> C 14 <br> D 6

Lera25 [3.4K]

What they said ^ I was just about to answer, but there’s popped up first lol

8 0

3 years ago

Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard deviation of 13. Use the empirical rule

Yuri [45]

Answer:

(a) 68% of people has an IQ score between 87 and 113.

(b) 5% of people has an IQ score less than 74 or greater than 126.

(c) 0.15% of people has an IQ score greater than 139.

Step-by-step explanation:

Given information:Scores of an IQ test have a bell-shaped distribution,

mean = 100

standard deviation = 13

According to the empirical rule

68% data lies between $\overline{x}-\sigma$ and $\overline{x}+\sigma$ .

95% data lies between $\overline{x}-2\sigma$ and $\overline{x}+2\sigma$ .

99.7% data lies between $\overline{x}-3\sigma$ and $\overline{x}+3\sigma$ .

(a)

$\overline{x}-\sigma=100-13=87$

$\overline{x}+\sigma=100+13=113$

$[\overline{x}-\sigma,\overline{x}+\sigma]=[87,113]$

Using empirical rule we can say that 68% of people has an IQ score between 87 and 113.

(b)

$\overline{x}-2\sigma=100-2(13)=74$

$\overline{x}+2\sigma=100+2(13)=126$

$[\overline{x}-2\sigma,\overline{x}+2\sigma]=[74,126]$

Using empirical rule we can say that 95% of people has an IQ score between 74 and 126.

The percentage of people has an IQ score less than 74 or greater than 126 is

P = 1- percent of people has an IQ score between 74 and 126.

P = 1- 95%

P = 5%

Therefore 5% of people has an IQ score less than 74 or greater than 126.

(c)

$\overline{x}-3\sigma=100-3(13)=61$

$\overline{x}+3\sigma=100+3(13)=139$

$[\overline{x}-3\sigma,\overline{x}+3\sigma]=[61,139]$

Using empirical rule we can say that 99.7% of people has an IQ score between 61 and 139.

The percentage of people has an IQ score less than 61 or greater than 139 is

P = 1- percent of people has an IQ score between 61 and 139.

P = 1- 99.7%

P = 0.3%

The percentage of people has an IQ score greater than 139 is

$P=\frac{1}{2}(0.3\%)=0.15\%$

Therefore 0.15% of people has an IQ score greater than 139.

5 0

3 years ago

What is the interior angle of a regular 25 gon

OLga [1]

Answer:

schläfli symbol {50}, t{25}

Coxeter diagram

Symmetry group Dihedral (D50), order 2×50

Internal angle (degrees) 172.8°

5 more rows

Step-by-step explanation:

7 0

3 years ago

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