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3 years ago

12 − x = 7x + 32 Step 1: -x = 7x + 20 Step 2: -8x = 20

Mathematics

1 answer:

pashok25 [27]3 years ago

8 0

Answer:

Step 3:

-8x/-8= 20/-8

x= -2.5

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Please help me with this question

telo118 [61]

Answer:

C, because minus is difference and plus is the sum

7 0

3 years ago

True or False: A race car driver tested his car for time from 0 to 60 mph, and for 20 tests obtained a mean of 4.85 seconds with

sattari [20]

Answer:

The given statement is false.

Step-by-step explanation:

We are given the following in the question:

95% confidence interval: (4.53,5.18)

Sample mean, $\bar{x}$ = 4.85 seconds

Sample size, n = 20

Alpha, α = 0.05

Sample standard deviation, σ = 1.47 seconds

Degree of freedom = n - 1 = 19

95% Confidence interval:

$\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}$

Putting the values, we get,

$t_{critical}\text{ at degree of freedom 4 and}~\alpha_{0.01} = \pm 2.09$

$4.85 \pm 2.09(\dfrac{ 1.47}{\sqrt{20}} )\\\\ = 4.85 \pm 0.69 \\\\= (4.16 ,5.54)$

Thus, the calculated confidence interval is different from the given confidence interval.

Hence, the given statement is false.

6 0

4 years ago

Geometry Special Quadrilaterals show work please

Charra [1.4K]

Answer:

a = 16

w = 125

x = 120

y = 55

Step-by-step explanation:

FINDING 'a'

31 = a + 46 / 2

62 = a + 46

16 = a

FINDING 'w'

* This section looks Non-Isosceles trapezoid so I will be following the rule according it

w + 55 = 180

w = 125

FINDING 'y'

y = 55

- Because of corresponding angles

FINDING 'x'

* In this case it looks like we are still dealing w/ an non-isosceles trapezoid.

x + 60 = 180

x = 120

Hope this helped ^^

(Please inform me of any mistakes or misunderstandings!)

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3 years ago

Anybody have the correct Answer for this math problem?

netineya [11]

Answer:

Teorema de Pitágoras

Step-by-step explanation:

Answer is 9.

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3 years ago

and Mandy takes 3.9 percent of jimmy chocolate jimmy has 5000 pieces of chocolate chocolate how much does jimmy have left

nevsk [136]

Answer:

Jimmy has 4805 left

Step-by-step explanation:

3.9% = 0.039

5000(0.039) = 195

Mandy took 195 pieces

5000 - 195 = 4805

Jimmy has 4805 left

6 0

3 years ago