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alexdok [17]
3 years ago
15

Evaluate the expression shown below and write your answer as a fraction in simplest form.

Mathematics
1 answer:
Ierofanga [76]3 years ago
8 0

Answer:

72 / 5

Step-by-step explanation:

( 12 / 5 ) + ( 6 / 5 )

= ( 12 + 6 ) / 5

= 18 / 5

[ ( 12 / 5 ) + ( 6 / 5 ) ] / ( 1 / 4 )

= ( 18 / 5 ) / ( 1 / 4 )

= ( 18 x 4 ) / 5

= 72 / 5

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You are considering renting a car from two different rental companies. Proxy car rental company charges. $0.32 per mile plus an
mash [69]
Let y = total charge for a car rental and x = miles driven
Proxy car equation: y = 0.32x + 18
YourPal equation: y = 0.36x + 12

Set equations right sides equal to each other... meaning their cost, y, are equal
0.32x + 18 = 0.36x + 12
18 = 0.04x + 12  (subtract 0.32x from both sides of the equation)
6 = 0.04x            (subtract 12 from both sides of the equation)
150 = x               (divide both sides of the equation by 0.04)
ANSWER: 150 miles
6 0
3 years ago
Solve this equation for x: 2x^2 + 12x - 7 = 0
zhannawk [14.2K]

Answer:

x=0.5355 or x=-6.5355

First step is to: Isolate the constant term by adding 7 to both sides

Step-by-step explanation:

We want to solve this equation: 2x^2 + 12x - 7 = 0

On observation, the trinomial is not factorizable so we use the Completing the square method.

Step 1: Isolate the constant term by adding 7 to both sides

2x^2 + 12x - 7+7 = 0+7\\2x^2 + 12x=7

Step 2: Divide the equation all through by the coefficient of x^2 which is 2.

x^2 + 6x=\frac{7}{2}

Step 3: Divide the coefficient of x by 2, square it and add it to both sides.

Coefficient of x=6

Divided by 2=3

Square of 3=3^2

Therefore, we have:

x^2 + 6x+3^2=\frac{7}{2}+3^2

Step 4: Write the Left Hand side in the form (x+k)^2

(x+3)^2=\frac{7}{2}+3^2\\(x+3)^2=12.5\\

Step 5: Take the square root of both sides and solve for x

x+3=\pm\sqrt{12.5}\\x=-3\pm \sqrt{12.5}\\x=-3+ \sqrt{12.5}, $ or $x= -3- \sqrt{12.5}\\$x=0.5355 or x=-6.5355

6 0
3 years ago
In the figure lines 1, m, and n are parallel. A classmate says you can use the corollary to side-splitter theorem to find x. Exp
defon
Answer: You should not make that assumption in this problem.

The side-splitter theorem is about the line segments that are formed on the transverals themselves. It is not talking about the distances on the set of parallel lines. If you wanted to find the value of x, you should look for another way to prove the relationship involving the x-value.
6 0
3 years ago
Two boys searching for buried treasure are standing underneath the same tree. one boy walks 12 m east and then 12 m north. the o
mylen [45]
Let
 The origin of coordinates the tree
 r1 = vector position of the child 1.
 r2 = vector position of the child 2
 Child 1:
 r1 = (12i + 12j)
 Child 2:
 r2 = (-18i + 11j)
 The scalar product will be given by:
 r1.r2 = ((12) * (- 18)) + ((12) * (11)) = - 84
 The scalar product of their net displacements from the tree is -84m ^ 2
5 0
3 years ago
Please help me with this
goldenfox [79]
For part A, if P is the center of that triangle, then PR and PT have the same length; therefore, triangle RPT is isosceles.  For part B, by the definition of an incenter...if P is an incenter, then it is the place where all the angle bisectors meet.  Therefore, angles SRP and PRT are congruent, as are angles STP and PTR.  Since the vertex angle measures 64, then each of the base angles by the isosceles triangle theorem measure 58.  Half of 58 makes the base angles within the smaller triangle measure 29.  And if both of those measure 29, by the triangle angle-sum theorem, 180-29-29 = 122  And that's the measure of angle RPT.  Eek.
7 0
3 years ago
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