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3 years ago

Help Please Which relations are functions?

Mathematics

1 answer:

Liula [17]3 years ago

7 0

I think its A and D, I'm takeing this 1 right know lol, if you already took it do you remember which were correct?

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William has $7.50 to spend at the pretzel shop. A pretzel costs $1.25 and a soft drink costs $0.90. He buys one drink and p Whic

Basile [38]

Complete Question

William has $7.50 to spend at the pretzel shop. A large pretzel costs $1.25 and a soft drink costs $0.90. He buys one drink and p pretzels. Which inequality can be used to find the number of pretzels William can buy?

a) 1.25p−0.9≤7.5

b) 1.25p+0.9≤7.5

c) 1.25p+0.9≥7.5

d) 1.25+0.9p≤7.5

Answer:

b) 1.25p+0.9≤7.5

Step-by-step explanation:

William has $7.50 to spend at the pretzel shop.

This means Williams can spend at least $7.50

A pretzel costs $1.25 and a soft drink costs $0.90. He buys one drink and ?pretzel

Therefore, the inequality can be used to find the number of pretzels William can buy is written as

1.25p+0.9≤7.5

Option b is the correct option

3 0

3 years ago

PLEASE HELP FASTT

denpristay [2]

Answer:

y = -3x + 1

Step-by-step explanation:

Plug in your x (2) and y (-5) values into your slope-intercept formula (y=mx+b).

-5 = -3(2) +b

Solve for b:

-5 = -3(2) + b

-5 = -6 + b

1 = b

Plug in the value of <em>b, </em>and<em> </em>the slope (-3) for the formula:

y = -3x + 1

8 0

3 years ago

Assume that the red blood cell counts of women are normally distributed with a mean of 4.577 million cells per microliter and a

serg [7]

Answer:

82.31% of women have red blood cell counts in the normal range from 4.2 to 5.4 million cells per microliter

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 4.577, \sigma = 0.382$

Approximately what percentage of women have red blood cell counts in the normal range from 4.2 to 5.4 million cells per microliter?

This is the pvalue of Z when X = 5.4 subtracted by the pvalue of Z when X = 4.2. So

X = 5.4

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{5.4 - 4.577}{0.382}$

$Z = 2.15$

$Z = 2.15$ has a pvalue of 0.9842

X = 4.2

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{4.2 - 4.577}{0.382}$

$Z = -0.99$

$Z = -0.99$ has a pvalue of 0.1611

0.9842 - 0.1611 = 0.8231

82.31% of women have red blood cell counts in the normal range from 4.2 to 5.4 million cells per microliter

3 0

3 years ago

Read 2 more answers

By how much does a square of 3 exceed the cube of 2

den301095 [7]

3^2 -2^3

9 - 8

Answer 1

6 0

3 years ago

What is the area of a circle whose equation is (x-3)² + (y + 1) ² =81?

kupik [55]

Okay, first, given the equation, we need to find out what the radius of the circle is. Let us state the general equation of a circle:

$\frac{(x-x_{1})^2}{r^2}+ \frac{(y-y_{1})_^2}{r^2}=1$

Where $(x_{1}, y_{1})$ is the centre of the circle. In this case, we don't need to know the centre. Just the radius.

Let us start by converting the equation into standard for, which I typed above. Divide both sides by 81.

$\frac{(x-3)^2}{81}+ \frac{(y+1)^2}{81}=1$

Great! We now know the radius of the circle. It is $\sqrt{81}$ because it is the bottom fraction. Now we know that the radius is 9.

So now lets input this into the area of circle formula:

$A=πr^2$

Now we insert our radius.

$A=9^2π$

$=A=81π$

You can convert that into a decimal if you wish.

Hope this helped!

~Cam943, Moderator

4 0

3 years ago