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2 years ago

Help! Expressions and equations

Mathematics

1 answer:

Dovator [93]2 years ago

5 0

Answer:

1. 16−6=10

2. 4⋅2+1

3. x÷25

4. y+8=40

Explanation:

This is an equation—two expressions are connected with an .This is an expression—no equal sign. This is an expression—no equal sign. This is an equation—two expressions are connected with an equal sign.

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The table below shows the number of cars Jing sold each month last year.

ella [17]

Answer:

The median of the data in the table is 19.

Step-by-step explanation:

We are given the following data that shows the number of cars Jing sold each month last year below;

Number of cars Jing sold: 13, 16, 19, 20.5, 23.5

For calculating the median, firstly we have to observe that the number of observations (n) in our data is even or odd because;

If n is odd, then the formula for calculating median is given by;

Median = $(\frac{n+1}{2} )^{th} \text{ obs.}$

If n is even, then the formula for calculating median is given by;

Median = $\frac{(\frac{n}{2} )^{th} \text{ obs.} + (\frac{n}{2}+1 )^{th} \text{ obs.} }{2}$

Here, the number of observations in our data is odd, i.e. n = 5.

So, Median = $(\frac{n+1}{2} )^{th} \text{ obs.}$

= $(\frac{5+1}{2} )^{th} \text{ obs.}$

= $(\frac{6}{2} )^{th} \text{ obs.}$

= 3rd obs. = 19

Hence, the median of the data in the table is 19.

7 0

2 years ago

The price of A cup of coffee was $2.20 yesterday today the price rose to $2.55 find the percentage increase round your answer to

Anna11 [10]

.35 is the raise of the cup of coffee

4 0

2 years ago

Ms. Gartland bought x number of shirts for the new members of her chorus. The cost for x number of shirt, including $3.99 shippi

Lilit [14]

Answer:

12.25s + 3.99 = 77.49 would be your equation used to find the amount of shirts purchased.

When we solve the equation, we get 6 which is the quantity of shirts Gartland purchased.

Step-by-step explanation:

We know the shirts were 12.25 but we didnt know how much she pruchased leaving our shirts (s) unknown.

We added 3.99 for shipping and our total cost was 77.49

We do 12.25s + 3.99 (shipping) = 77.40 total cost

5 0

1 year ago

The probability of rain on any given day is 2/3 . What is the probability of at most one day of rain during the next three days?

Aleks [24]

Answer:

7/27 ≈ 25.9%

Step-by-step explanation:

"At most one" means either exactly 0 or exactly 1.

P(at most 1) = P(0) + P(1)

Using binomial probability:

P(r) = nCr pʳ qⁿ⁻ʳ

P(0) = ₃C₀ (⅔)⁰ (⅓)³⁻⁰ = 1/27

P(1) = ₃C₁ (⅔)¹ (⅓)³⁻¹ = 2/9

So the probability that it rains on at most one day is:

P(at most 1) = 1/27 + 2/9

P(at most 1) = 7/27

P(at most 1) ≈ 0.259

3 0

2 years ago

What is the classification for this polynomial 7 monomial

DerKrebs [107]

Polynomials can be classified two different ways - by the number of terms and by their degree.

1. Number of terms.

A monomial has just one term. For example, 4x2 .Remember that a term contains both the variable(s) and its coefficient (the number in front of it.) So the is just one term.
A binomial has two terms. For example: 5x2 -4x
A trinomial has three terms. For example: 3y2+5y-2
Any polynomial with four or more terms is just called a polynomial. For example: 2y5+ 7y3- 5y2+9y-2

Practice classifying these polynomials by the number of terms:

1. 5y

2. 3x2-3x+1 

3. 5y-10

4. 8xy

5. 3x4+x2-5x+9 

Answers: 1) Monomial 2) Trinomial 3) Binomial 4) Monomial 5) Polynomial

2. Degree. The degree of the polynomial is found by looking at the term with the highest exponent on its variable(s).

Examples:
5x2-2x+1 The highest exponent is the 2 so this is a 2nd degree trinomial.
3x4+4x2The highest exponent is the 4 so this is a 4th degree binomial.
8x-1 While it appears there is no exponent, the x has an understood exponent of 1; therefore, this is a 1st degree binomial.
5 There is no variable at all. Therefore, this is a 0 degree monomial. It is 0 degree because x0=1. So technically, 5 could be written as 5x0.
3x2y5 Since both variables are part of the same term, we must add their exponents together to determine the degree. 2+5=7 so this is a 7th degree monomial.
Classify these polynomials by their degree.

1.7x3+52+1

2.6y5+9y2-3y+8

3.8x-4

4.9x2y+3

5.12x2

Answers 1) 3rd degree 2) 5th degree 3) 1st degree 4) 3rd degree 5) 2nd degree

5 0

2 years ago