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sergey [27]
3 years ago
12

Lf R(x) = x2 – 3x – 1, find R(-2). a.9 b.-9 c.-3 d.-11

Mathematics
1 answer:
fenix001 [56]3 years ago
6 0

Answer:

A.

Step-by-step explanation:

If R(-2), then x = -2. Just plug in -2 for x. -2^2 - 3(-2) - 1 = 4 + 6 - 1 = 10 - 1 = 9. The answer is 9.

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If 3 apples cost $6, how much would 12 apples cost?
zhenek [66]
So 3 apples=6 dollars
therefor if we divide both sides by 3
1 apple=2 dollares

so therfor for every 1 apple, you pay 2 dollars

so if 12 apples
12 times 2=24
24 dollars

anonther way is
3 apples=6 dollars
6 apples=12 dollars
9 apples= 18 dollars
12 apples= 24 dollars

4 0
4 years ago
Read 2 more answers
Richard and Teo have a combined age of 37. Richard is 13 years older than twice Teo's age. How old are Richard and Teo?
marysya [2.9K]

Answer:

Teo is 8 years old and Richard is 29 years old

Step-by-step explanation:

Let us solve the question

Assume that Teo is x years old

∵ Teo is x years old

∵ Richard is 13 years older than twice Teo's age

→ It means multiply x by 2, then add 13 to get the age of Richard

∴ Richard's age = 2x + 13

∵ Richard and Teo have a combined age of 37 years

→ Add their ages and equate the sum by 37

∴ x + 2x + 13 = 37

→ Add the like terms

∵ (x + 2x) + 13 = 37

∴ 3x + 13 = 37

→ Subtract 13 from both sides

∵ 3x + 13 - 13 = 37 - 13

∴ 3x = 24

→ Divide both sides by 3 to find x

∴ x = 8

∵ x represents Teo's age

∴ Teo is 8 years old

→ Substitute the value of x in the expression of Richard age to find his age

∵ Richard age = 2(8) + 13 = 16 + 13 = 29

∴ Richard is 29 years old

∴ Teo is 8 years old and Richard is 29 years old

8 0
3 years ago
What is the volume of a right circular cylinder with a base diameter of 6 m and a height of 5 m?
lys-0071 [83]
If the diameter of it is 6, then its radius is half that.

\bf \textit{volume of a right circular cylinder}\\\\
V=\pi r^2 h~~
\begin{cases}
r=radius\\
h=height\\
-----\\
r=3\\
h=5
\end{cases}\implies V=(\pi )(3^2)(5)
6 0
4 years ago
Read 2 more answers
In a mid-size company, the distribution of the number of phone calls answered each day by each of
Ilia_Sergeevich [38]

Answer:

Prob ( 41 <= X <= 77) =

Prob ( (41-59)/9 <= Z <= (77-59)/9 ) =  <--- changes to z scores

Prob ( -18/9 <= Z <= 18/9 ) =

Prob ( -2 <= Z <= 2) =

Prob ( z<=2) - Prob(Z<=-2)  =       <--- by property of the normal bell curve

=  0.9772 - 0.0228   <--- per the normal distribution table

= 0.9544

Step-by-step explanation:

make sense ?

4 0
3 years ago
What is the volume of the sphere? Please
Black_prince [1.1K]

Answer:

   3053.6 mm³

Step-by-step explanation:

The volume of a sphere is given by the formula ...

  V = 4/3πr³ . . . . . where r is the radius, half the diameter

__

For the given sphere, the volume is ...

  V = 4/3π(9 mm)³ = 972π mm³ ≈ 3053.6 mm³

4 0
3 years ago
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