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Umnica [9.8K]
3 years ago
15

Write as an algebraic expression: the product of 7 and y, increased by 20 ​

Mathematics
2 answers:
Vaselesa [24]3 years ago
3 0
7y+20 hope this helps
tatuchka [14]3 years ago
3 0

Answer: 7y + 20

Step-by-step explanation:

It says the product of 7 and y so you multiply both of them. And increase means add, so you add 20

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If Johnny has 2 apples and give 1 to Sally how many does Johnny have left?
Gala2k [10]
Johnny has 1 apple left.
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Mary bought an antique chair for $500. If the value of her chair increases 6% annually, what will the value of Mary's chair be a
sweet [91]

Answer: multiply then simlify if needed

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
A study was designed to investigate the effects of two​ variables, (1) A​ student's level of mathematical anxiety and​ (2) teach
Mashcka [7]

Answer:

P(X>400)=P(\frac{X-\mu}{\sigma}>\frac{400-\mu}{\sigma})=P(Z>\frac{400-440}{20})=P(z>-2)

And we can find this probability using the complement rule:

P(z>-2)=1-P(z

And in order to find these probabilities we can find tables for the normal standard distribution, excel or a calculator.  

P(z>-2)=1-P(z

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution to the problem

Let X the random variable that represent the scores of a population, and for this case we know the distribution for X is given by:

X \sim N(440,20)  

Where \mu=440 and \sigma=20

We are interested on this probability

P(X>440)

And the best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\sigma}

If we apply this formula to our probability we got this:

P(X>400)=P(\frac{X-\mu}{\sigma}>\frac{400-\mu}{\sigma})=P(Z>\frac{400-440}{20})=P(z>-2)

And we can find this probability using the complement rule:

P(z>-2)=1-P(z

And in order to find these probabilities we can find tables for the normal standard distribution, excel or a calculator.  

P(z>-2)=1-P(z

6 0
4 years ago
What is the distance between the points (-3, -4) and (5, 2)?
alexandr1967 [171]
Using the picture:

Between (-3, -4) and (5, -4) is:
The difference is in the x units:  5 - (-3) = 5 + 3 = 8

Between (5, 2) and (5, -4) is:
The difference is in the y units:  2 - (-4) = 2 + 4 = 6

We know the shape is a right angled triangle:

By applying Pythagoras' Theorem:

let the hypotenuse be x:

x² = 6² + 8²

x² = 36 + 64

x² = 100

Take square root of both sides

√x²  = √100

x = 10

Distance between the 2 points = 10 units.

Option D. 
6 0
3 years ago
A triangle in which all of the angles are smaller than 90 degrees is called what triangle ?
Sholpan [36]
This is an Acute triangle
6 0
3 years ago
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