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masya89 [10]
2 years ago
8

What is the answer??????????

Mathematics
2 answers:
Troyanec [42]2 years ago
4 0
The answer is 91 ............
Makovka662 [10]2 years ago
3 0

Answer:

91

Step-by-step explanation:

We just have to put in the value of x into the equation.

  8 - 4[x - (2x² + 5)] + 3

= 8 - 4[3 - (2×3² + 5)] + 3

= 8 - 4[3 - (2×9 + 5)] + 3

= 8 - 4[3 - (18 + 5)] + 3

= 8 - 4(3 -23) + 3

= 8 - 4(-20) + 3

= 8 - (-80) + 3

= 8 + 80 + 3

= 91

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Answer: None

Step-by-step explanation: They are parallel and would never intersect

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3 years ago
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I don't know how to do this or what i'm doing plz help
mote1985 [20]

recalling that d = rt, distance = rate * time.


we know Hector is going at 12 mph, and he has already covered 18 miles, how long has he been biking already?


\bf \begin{array}{ccll} miles&hours\\ \cline{1-2} 12&1\\ 18&x \end{array}\implies \cfrac{12}{18}=\cfrac{1}{x}\implies 12x=18\implies x=\cfrac{18}{12}\implies x=\cfrac{3}{2}


so Hector has been biking for those 18 miles for 3/2 of an hour, namely and hour and a half already.

then Wanda kicks in, rolling like a lightning at 16mph.

let's say the "meet" at the same distance "d" at "t" hours after Wanda entered, so that means that Wanda has been traveling for "t" hours, but Hector has been traveling for "t + (3/2)" because he had been biking before Wanda.

the distance both have travelled is the same "d" miles, reason why they "meet", same distance.


\bf \begin{array}{lcccl} &\stackrel{miles}{distance}&\stackrel{mph}{rate}&\stackrel{hours}{time}\\ \cline{2-4}&\\ Hector&d&12&t+\frac{3}{2}\\[1em] Wanda&d&16&t \end{array}\qquad \implies \begin{cases} \boxed{d}=(12)\left( t+\frac{3}{2} \right)\\[1em] d=(16)(t) \end{cases}


\bf \stackrel{\textit{substituting \underline{d} in the 2nd equation}}{\boxed{(12)\left( t+\frac{3}{2} \right)}=16t}\implies 12t+18=16t \\\\\\ 18=4t\implies \cfrac{18}{4}=t\implies \cfrac{9}{2}=t\implies \stackrel{\textit{four and a half hours}}{4\frac{1}{2}=t}

7 0
3 years ago
Consider the function f(x) = 3x2 + 7x + 2.
Llana [10]

Answer:

Step-by-step explanation:

This function I believe has one x intercept which is (-2/13,0)

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3 years ago
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What is the slope of the line that passes through the points (-3,2) and (-1,-5)
Oduvanchick [21]

Answer:

m = -7/2

Step-by-step explanation:

(y2-y1) / (x2-x1)

->

(-5 - 2) / ( -1 -3)

= -7/2

hope that helps :D

7 0
3 years ago
Find the value of x in the triangle shown below.<br> Choose 1 answer:
Ad libitum [116K]

For the triangle, x is 12 units long.

Step-by-step explanation:

Step 1:

According to the Pythagorean theorem, the square of the hypotenuse is equal to the sum of the squares of the other two sides.

The hypotenuse is the side which is the longest in the triangle and is always opposite the right angle.

In the given triangle, the hypotenuse is 13 units long. The other two sides measure 5 units and x units.

Step 2:

By substituting the known values, we get

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x = 12.

Rounding this off to the nearest hundred, we get that x is 12 units long.

7 0
3 years ago
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