MATHEMATICS MIDDLE SCHOOL

PLEASE HELP
WILL MARK BRAINLIEST
PLEASE HELP WILL MARK BRAINLIEST - 1

Answers

Answer 1
Answer:

Answer:

C

Step-by-step explanation:

There should always be a decimal between two numbers in order to classify as a scientific notation.
Answer 2
Answer:

Answer:

The answer is C. All of the answers listed for that choice is correct.

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How to solve -7=-11+v/5?
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Sin 2x=check all that apply
A. 2sin x cos x
B. 1-2 sin^2 x
C. 2cos x sin x
D. 2sin x +2cos x

Answers

Answer:

A,C

Step-by-step explanation:

sin 2x=sin (x+x)=sinx cos x+cos x sin x=2 sin x cos x

or =2 cos x sin x

[sinx cox=cos x sin x ]

What is the square root of 52 rounded to the nearest tenth?

Answers

The square root of 52 is 7.2
7.2 is the square root of 52 hope this helps!

I rly need some help please

Answers

Answer:

B) 12.5%

Step-by-step explanation:

1. Find amount spent on clothes in July

$2800 * 8% = j

j = $224

2. Find amount spent of clothes in August

$224 + $126 = a

a = $350

3. Find the amount's percentage of the total

$350/$2800 = x

x = 0.125 = 12.5%

A pillow that usually costs $18 is marked down 25%. Which expressions can be used to find the new price of the pillow?

Answers

Answer:

x = 18-(0.25×18)

Step-by-step explanation:

The price of the pillow = $18.00

cost is marked down = 25% = (25)/(100) = 0.25

Let the new price be x

The expression that can be used to find the new price of the pillow will be

x = 18-(0.25×18)

n= new price

n=18-(18*0.25)

Where is the vertex of the equation?y = x2 – 18x + 80

Answers

Answer:

vertex = (9, - 1 )

Step-by-step explanation:

Given a quadratic in standard form, y = ax² + bx + c : a ≠ 0

Then the x- coordinate of the vertex is

x_(vertex) = - (b)/(2a)

y = x² - 18x + 80 ← is in standard form

with a = 1 and b = - 18, thus

x_(vertex) = - (-18)/(2) = 9

Substitute x = 9 into the function for corresponding value of y

y = 9² - 18(9) + 80 = 81 - 162 + 80 = - 1

Vertex = (9, - 1 )

Evaluate the expression when x = –11.2x – 19

A.
41

B.
3

C.
–3

D.
–41

Answers

2x - 19
Let's substitute the value of x in the equation

2 ( -11 ) - 19
-22 - 19
-41

So correct option is D. 

Hope this helps you..  :)
2 (-11) - 19
-22 - 19 = -41

Your answer is D: -41
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