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Lerok [7]
3 years ago
10

If m = 9, what is the value of the expression 3m - 4?

Mathematics
2 answers:
fomenos3 years ago
8 0

Answer:

23

Step-by-step explanation:

  1. let's subsitute into 3m-4 using 9
  2. 3(9)-4
  3. now let's multiply 3*9 which is 27
  4. 27-4 = 23
  5. we are done :)
larisa [96]3 years ago
6 0

Answer: 23

Step-by-step explanation:

3(9) - 4

27 - 4

23

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Find the solution to the equation below.<br> 2x^2+3x-20=0
mariarad [96]

Answer:

  x = -4, 5/2

Step-by-step explanation:

A quadratic can be solved may ways, including graphing, factoring, and the quadratic formula. You can also check possible answers by making use of the relationships between solutions and the coefficients.

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A graph is attached. It shows the solutions to be -4 and 5/2.

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When factored, the equation becomes ...

  (2x -5)(x +4) = 0 . . . . . has solutions x=-4, x=5/2 (these make the factors zero)

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Using the quadratic formula, the solutions of ax^2 +bx +c = 0 are found from ...

  x = (-b±√(b²-4ac))/(2a)

  x = (-3±√(3²-4(2)(-20))/(2(2)) = (-3±√169)/4 = {-16, +10}/4

  x = {-4, 5/2}

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For ax^2 +bx +c = 0, the solutions must satisfy ...

  product of solutions is c/a = -20/2 = -10

Only the first and last choices have this product.

  sum of solutions is -b/a = -3/2

Only the first choice (-4, 5/2) has this sum.

8 0
3 years ago
The figure shows the front side of a metal desk in the shape of a trapezoid.
Alenkinab [10]

Answer:

Area of trapezoid is 16ft^2.

Therefore, option 2nd  is correct.

Step-by-step explanation:

We have been given both the sides a=3 and b=5.

And height that is h=4

We will use the formula find the area of trapezoid is:

\frac{a+b}{2}\cdot h

Substitute the formula we get:

\frac{3+5}{2}\cdot 4

\Rightarrow \frac{8}{2}\cdot 4

\Rightarrow 16.

Area of trapezoid is 16ft^2.

Therefore, option 2nd  is correct.

6 0
3 years ago
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A shirt is on sale for 30% off. The original price is $26.98. What is the sale price?
Goshia [24]

100% - 30% = 70%

The shirt is selling for 70% of the original price.

Multiply the original price by 70%

26.98 x 0.70 = 18.89

The sale price is $18.89

6 0
3 years ago
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Is a tray with a circumference of 32 inches is big enough to
yKpoI14uk [10]

Answer:

Yes

Step-by-step explanation:

Circumference formula is C=2 pi r, if you divide the pizza by 2 to get the radius,5, then input it into the formula to get 31.41592654, and since this number is smaller than 32 it will fit. If 10 is the radius it will not fit.

7 0
3 years ago
This one is algebra.....
vodomira [7]

{Hello~!\:}

<h2>Your answer will be is :</h2><h2></h2><h3>B. And C.</h3><h3></h3>

Hope It Helps. . .

#LearnWithBrainly

\underline{A~n~s~w~e~r~:\;}

\bold{Jace\;} ^-^

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