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PSYCHO15rus [73]
3 years ago
15

Izzie recently took a math test where each correct answer was worth 8.7 points. She also correctly answered a bonus question wor

th 13 points. If Izzie score a 108.7 on the test, how many questions did she answer correctly? Be sure to set up an equation before solving the problem
Mathematics
1 answer:
harina [27]3 years ago
8 0
Let's use x as the number of questions she answered correctly. If we make an equation of out the question, it would be 8.7x+13=108.7 To solve the equation subtract 13 from both sides. So it will leave you with 8.7x=108.7-13, which is 8.7x=95.7. Divide both sides by 8.7, which will give you x=11. She answered 11 questions correctly.
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What does -7x - 5x + 8 = -16 equal?
elena55 [62]

Answer:

x=2

Step-by-step explanation:

combine like terms= -7x -5x = -12x

-12x + 8 = -16

subtract 8 from both sides

-12x = -24

divide both sides by -12

x = 2

3 0
3 years ago
I have no idea what to do for this question somebody please help
Aleonysh [2.5K]

Answer:

405π

Step-by-step explanation:

Use the formula for Volume Of Cylinder (V=πr²h) where "V" represents the volume, "r" represents the radius, and "h" represents the height

<u>The volume and the radius are given. (V=45π, r=3)</u>

<u>1. Solve for height</u>

V=πr²h

45π=π3²h

45π/π=3²h

45=3²h

45=9h

45/9=h

h=5

<u>2. Plug the new radius (3*3=9) into this formula and solve for "V"</u>

V=π9²5

V=π81*5

V=405π

NEW VOLUME AFTER A TRIPLED RADIUS IS 405π

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6 0
2 years ago
Determine the value of x.
Akimi4 [234]

Answer:   \frac{10}{\sqrt{3}}

This is equivalent to \frac{10\sqrt{3}}{3}

======================================================

Explanation:

To get the first value mentioned above, we simply divide the long leg (10) over the square root of 3.

This is due to the fact that if x is the short leg, then x*sqrt(3) is the long leg. We go in reverse of this process to go from long leg to short leg.

The expression \frac{10}{\sqrt{3}} is the same as \frac{10\sqrt{3}}{3} after we multiply top and bottom by sqrt(3) to rationalize the denominator.

Side notes:

  • This entire process only applies to 30-60-90 triangles.
  • The hypotenuse of a 30-60-90 triangle is twice as long as the short leg, so the hypotenuse is 2x = 2*\frac{10\sqrt{3}}{3} = \frac{20\sqrt{3}}{3}  units long.
  • You could use the tangent ratio to help isolate x. You would either say tan(30) = x/10 or tan(60) = 10/x as the first equation to set up.
8 0
3 years ago
Find approximate radius of a circle that has an area of 60 square centimeters
elena-14-01-66 [18.8K]
Area of circle = πr^2
60=πr^2

we need to find radius (r)
so we solve for r
r^2=60/π
r=√(60/π)
r= 4.37
6 0
3 years ago
Determine the x-intercept for 3x + 2y = 14. A) (7, 0) B) (0, 7) C) ( 14 3 , 0) D) (0, 14 3 )
Anettt [7]

Answer:

\large\boxed{C.\ \left(\dfrac{14}{3},\ 0\right)}

Step-by-step explanation:

\text{The x-intercept is for y = 0.}\\\\\text{Put y= 0 to the equation}\ 3x + 3y = 14:\\\\3x + 3(0) = 14\\\\3x + 0 = 14\\\\3x = 14\qquad\text{divide both sides by 3}\\\\x =\dfrac{14}{3}

4 0
3 years ago
Read 2 more answers
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