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kompoz [17]
3 years ago
15

3x-4=17 whats he answer x

Mathematics
2 answers:
Colt1911 [192]3 years ago
8 0

17+4=21 and 3x7=21 too, so x=7. hope you understand it now:)

Anestetic [448]3 years ago
4 0

Answer:

x = 7

Step-by-step explanation:

3x-4=17\\3x=17+4\\3x=21\\x=\frac{21}{3}\\ x=7

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Suppose that Matthew can choose to get home from work by car or bus.
Verizon [17]

Answer:

B-91%

Step-by-step explanation:

Bayes Theorem:

Two events, A and B.

P(B|A) = \frac{P(B)*P(A|B)}{P(A)}

In which P(B|A) is the probability of B happening when A has happened and P(A|B) is the probability of A happening when B has happened.

In this question:

Event A: arriving home after 7 p.m.

Event B: getting home by bus.

When he chooses to get home by bus, he arrives home after 7 p.m. 25 percent of the time.

This means that P(A|B) = 0.25

Because the bus is cheaper, he uses the bus 70 percent of the time.

This means that P(B) = 0.7

Probability of getting home after 7 p.m.

70% of the time he uses bus, and by bus, he arrives arrives home after 7 p.m. 25 percent of the time.

100 - 70 = 30% of the time he uses the car, and by car, he arrives home after 7 p.m. 6 percent of the time.

So

P(A) = 0.7*0.25 + 0.3*0.06 = 0.193

What is the approximate probability that Matthew chose to get home from work by bus, given that he arrived home after 7 p.m.?

P(B|A) = \frac{0.7*0.25}{0.193} = 0.9067

Rouding up, 91%.

So the correct answer is:

B-91%

7 0
4 years ago
you invest $1000 dollars in an account at 2.5% per year simple interest. How much will you have in the account at the beginning
Lina20 [59]
<span>I = PRT

</span><span>P = 1000
R = 2.5% -- change to a decimal = .025
T = 3
</span>
<span> now we sub I = PRT
I = (1000)(.025)(3)
I = 75
</span><span> so at the end of 3 years, there will be : 1000 + 75 = $ 1075 in the account
</span>
Hope this helps!!
~Lena~
<span />
7 0
4 years ago
Read 2 more answers
Plslslslsl help ASAPPPP 10 points and you win brainlist
dem82 [27]

Answer:

71

Step-by-step explanation:

Take the cost of the item and multiply by the commission percent

800 * 8.875%

Change to decimal form

800*.08875

71

3 0
3 years ago
Read 2 more answers
The width of a rectangle is 6 2/3 inches. The length of the is twice it’s width. What so the perimeter of the rectangle?
Nookie1986 [14]
\text {Width = }  6\dfrac{2}{3}  \text { inches}&#10;


The length is twice its width:
\text {Length = } 2 \times 6\dfrac{2}{3} \text { inches}

Change to improper fraction:
\text {Length = }2 \times \dfrac{20}{3} \text { inches}

Combine into single fraction:
\text {Length = } \dfrac{40}{3} \text { inches}


Find Perimeter :
\text {Perimeter = Length + Length + Width + Width}

\text {Perimeter = } \dfrac{40}{3} + \dfrac{40}{3}   + \dfrac{20}{3}   + \dfrac{20}{3} = \dfrac{120}{3}  = 40 \text { inches}


\bf \text {Answer: Perimeter =  40 inches}
6 0
4 years ago
Read 2 more answers
If cos(x)=-1/4 and tan(x)&lt;0 what is sin(2x)​
nata0808 [166]

By definition of tangent,

tan(<em>x</em>) = sin(<em>x</em>) / cos(<em>x</em>)

so if tan(<em>x</em>) < 0, and we're given cos(<em>x</em>) = -1/4 < 0, then it follows that sin(<em>x</em>) > 0.

Recall the Pythagorean identity:

cos²(<em>x</em>) + sin²(<em>x</em>) = 1   →   sin(<em>x</em>) = + √(1 - cos²(<em>x</em>))

Then

sin(<em>x</em>) = √(1 - (-1/4)²) = √(15/16) = √(15)/4

Recall the double angle identity:

sin(2<em>x</em>) = 2 sin(<em>x</em>) cos(<em>x</em>)

Then

sin(2<em>x</em>) = 2 • √(15)/4 • (-1/4) = -2√(15)/16 = -√(15)/8

8 0
3 years ago
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