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expeople1 [14]
3 years ago
15

Write an algebraic expression for the situation: 2.5 less than a number d

Mathematics
1 answer:
algol133 years ago
3 0

Answer:

A.

Step-by-step explanation:

I don’t know how to explain it. It’s just that you need to find a number that is 2.5 less than D. So, you just subtract that 2.5 from D.

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A company manufactures a large number of rods. The lengths of the rods are normally distributed with a mean length of 4.4 inches
Elza [17]

Answer:

0.78814

Step-by-step explanation:

We solve using z score

z = (x-μ)/σ, where

x is the raw score = 4.0 inches

μ is the population mean = 4.4 inches

σ is the population standard deviation = 0.5 inches

z = 4.0 - 4.4/0.5

z = -0.8

Probability value from Z-Table:

P(x<4.0) = 0.21186

P(x>4.0) = 1 - P(x<4.0)

= 1 - 2.1186

= 0.78814

The probability that the rod you chose will be greater than 4.0 inches is 0.78814.

4 0
4 years ago
At the circus, a clown is shot from a cannon. This situation can be modeled by the function: h = – 16t2 + 45t + 15, where 'h' is
EastWind [94]

Answer:

t = 3.11 seconds

Step-by-step explanation:

Given that,

At the circus, a clown is shot from a cannon. This situation can be modeled by the function :

h = -16t^2 + 45t + 15

Where

'h' is height in feet and 't' is time in seconds

We need to find how long did it take for the clown to reach his highest point. It can be calculated as follows :

-16t^2 + 45t + 15=0

We need to solve for t. It can be calculated as follows :

t=\dfrac{-45\pm \sqrt{45^2-4(-16)(15)} }{2(-16)}\\\\t=-0.301\ \text{and}\ 3.11\ s

So, the required time is 3.11 seconds.

8 0
3 years ago
Please help me!!! I feel sick and really want to go to bed so please help soon!! thank u!!!
Neko [114]

Answer:

I think It is 8 as well, but not sure

Step-by-step explanation:

4 0
3 years ago
What is the measurement of angle x plz help me !
Ilia_Sergeevich [38]
x = 60, since its n equilateral triangle
4 0
3 years ago
Read 2 more answers
If f(a) = 3a - a2, which of the following are not true statements?
kherson [118]

Answer:

f(-1) = 2

f(0) = 3

Step-by-step explanation:

f(a) = 3a - a²

  • f(4)= 3*4-4²= -4 ⇒  correct
  • f(3)= 3*3-3²= 0 ⇒ correct
  • f(-1) = 3*(-1)-(-1)²=-3+1= -2 ⇒ incorrect
  • f(0) = 3*0-0²= 0 ⇒ incorrect
  • f(-5) = 3*(-5)-(-5)²= -15-25= -40 ⇒ correct
6 0
3 years ago
Read 2 more answers
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