What is the expression 9-z when z=8

Mathematics

1 answer:

IgorLugansk [536]2 years ago

7 0

When z=8:

9-(8)=1

Since z is equal to 8, it can be substituted in and solved

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The diameter of a bike is 90cm. How far would it travel after 5 revolutions?

Nookie1986 [14]

We know that
[length of a circumference]=2*pi*r
diameter=90 cm-------------> r=d/2--------> r=45 cm
[length of a circumference]=2*pi*45----------> 90*pi cm

<span>with 1 revolution will go the length of the wheel</span>

if 1 revolution is-------------------> 90*pi cm
5 revolution is--------------------> X
X=5*90*pi----------> 1413 cm

the answer is 1413 cm

7 0

3 years ago

To get the 10% discount, a shopper must spend at least $200.

Liula [17]

Answer:

$d\geq \$200$

Step-by-step explanation:

we know that

To get the 10% discount, a shopper must spend at least $200

Let

d ------> represent the spending (in dollars) of a shopper who gets the discount

therefore

The value of d must be greater than or equal to $200

$d\geq \$200$

5 0

3 years ago

The brain volumes (cm cubed) of 20 brains have a mean of 1105.1 cm cubed and a standard deviation of 123.5 cm cubed. Use the g

kramer

Answer:

$1332.1 \:cm^3$ is neither significantly low nor significantly high.

Step-by-step explanation:

From the information given, we know that:

The mean is $\bar{x}=1105.1 \:cm^{3}$ and the standard deviation is $\sigma=123.5 \:cm^{3}$ .

The range rule of thumb says that:

$minimum \:usual \:value=\bar{x}-2\sigma\\\\maximum \:usual \:value=\bar{x}+2\sigma$

Applying these definitions, we get that

$minimum \:usual \:value=1105.1-2(123.5)=858.1 \:cm^3\\\\maximum \:usual \:value=1105.1+2(123.5)=1352.1 \:cm^3$

We note that $1332.1 \:cm^3$ is between $858.1 \:cm^3$ and $1352.1 \:cm^3$ , which indicates $1332.1 \:cm^3$ is neither significantly low nor significantly high.