A student claims that the expression “9 times the sum of a number and 13” is translated to the algebraic expression 9n + 13. Is the student correct? If not, what is the correct expression?

Answers

Answer 1

Answer:

The student is wrong, the correct expression is 9(n + 13).

What are expressions?

Mathematical expressions consist of at least two numbers or variables, at least one arithmetic operation, and a statement. It's possible to multiply, divide, add, or subtract with this mathematical operation.

Given the phrase “9 times the sum of a number and 13”

Let, n = the number

Therefore,

The sum of a number and 13 is:

n + 13

9 times the sum of a number and 13” can be written as,

9(n + 13)

Hence, the student is wrong.

Learn more about expression;

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Answer 2

Answer: 9*13+n

9*
A sum of a number and 13

so your answer is correct.

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What two numbers added equal 40 but when subtracted equal 10? PLZ!!!!!!!!!!!!!!!!!!!! HELPPPPPPPPPPPPPPPPPPPP

Answers

Answer:

25 and 15

You can easily make a system of equations:

x + y = 40

x - y = 10

Solving for x on equation 2 gets x = 10 + y.

Plugging in this into the first equation, you get 10 + y + y = 40

Thus, 10 + 2y = 40

y = 15.

Plugging this back into either equation gets x = 25.

Use the squared identities to simplify sin^2x cos^2x

Answers

Answer:

$(1-cos^2(2x))/(4)$

Step-by-step explanation:

We have the following expression

$sin^2x *cos^2x$

Whe know that:

$sin^2(x) = (1-cos(2x))/(2)\n\ncos^2(x)=(1+cos(2x))/(2)$

Now replace these equations in the main expression and simplify

$((1-cos(2x))/(2))*((1+cos(2x))/(2))$

$(((1-cos(2x))(1+cos(2x)))/(4))$

Apply the following property

$(a + b) (a-b) = a ^ 2 -b ^ 2$

Then

$(((1-cos(2x))(1+cos(2x)))/(4))=(1^2-cos^2(2x))/(4)$

Finally:

$(((1-cos(2x))(1+cos(2x)))/(4))=(1-cos^2(2x))/(4)$

True or false all rectangles are quadrilaterals

Answers

Answer:

True

Step-by-step explanation:

All rectangles are quadrilaterals because a quadrilateral, by definition, is a shape having 4 straight sides.

Choose the answer. 1. (1 pt) A rectangular playground measures 75 feet by 40 feet. What is the area of the playground? A. 115 feet B. 115 square feet C. 3,000 feet D. 3,000 square feet

Answers

the answer would be D 3,000 square feet because 75*40=3,000

75*40=3,000
so now ull get ur answer..D :)
D-3000

A square playing field has an area of 1,255 square yards. about how long is each side of the field

Answers

square area=legnth^2 aera=1255 1255=side^2 take squaer root of both sides aprox 35.425979167837 yards=legnth of eachsie

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