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Zina [86]
3 years ago
5

Explain when to use Mental Math

Mathematics
1 answer:
I am Lyosha [343]3 years ago
3 0
It is best to use mental math with some equations (5x5 or something that is easy enough that work does not have to be shown 10 dived by 5
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Solve the formula d = rt for t. A. t = rd B. t = d – r C. t = D. t =
tekilochka [14]

rt=d\qquad\text{divide both sides by}\ r\neq0\\\\\dfrac{rt}{r}=\dfrac{d}{r}\\\\\boxed{t=\dfrac{d}{r}}

3 0
3 years ago
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Graph the quadratic functions y=-2xandy=-2x2 + 4 on a separate piece of paper. Using those graphs, compare and contrast the shap
dedylja [7]

Y = -2x^2

h = Xv = -B/2A = 0/-4 = 0.

k = -2*0^2 = 0.

V(0,0).

Use the following points for graphing:

Y = -2x^2.

(x,y)

(-2,-8)

(-1,-2)

V(0,0)

(1,-2)

(2,-8)

Y = -2x^2 + 4.

h = Xv = -B/2A = 0/-4 = 0.

k = Yv = -2*0^2 + 4 = 4.

V(0,4).

(-2,-4)

(-1,2)

V(0,4)

(1,2)

(2,-4)

8 0
2 years ago
A cylinder has a radius of 5 inches and a height of 9 inches. What is the volume of the cylinder in cubic inches? Use 3.14 for π
zlopas [31]
Okkaay so this would be 3.14 x (5x5) x 9 = <span>706.5
V=</span>πr2h
6 0
3 years ago
Based on this stock price model, what is the best prediction of what the price will do next?
andrew11 [14]
Go up. This is because the stock price is going up.
7 0
2 years ago
Any possible way i can get some help? steps or not.. i’m in need..
igor_vitrenko [27]

Answer:

The answer to your question is:

7.-  y = 6 units

8.-  a = 10.6 in

9.- 41.6 ft

Step-by-step explanation:

7.- That is a right triangle and the hypotenuse is y.

     Use the pythagorean theorem to find y.

        y² = (3√2)² + (3√2)²

         y² = 9(2) + 9(2)

         y² = 18 +18

         y² = 36

        y = 6 units

8.-

  hypotenuse = 15 in

  c² = a² + b²

  a = b  so

 c² = a² + a²

c² = 2a²

c² / 2  = a²

a² = 15² / 2

a² = 112.5

a = 10.6 in

9.-

Use trygonometry to solve this triangle

height = 36 feet

sin Ф = 36 / hypotenuse

hypotenuse = 36 / sin Ф

hypotenuse = 36 / sin60

hypotenuse = 36 / 0.86

hypotenuse = 41.6 ft

4 0
3 years ago
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