MATHEMATICS HIGH SCHOOL

Simplify the expression. Please help, really stuck!!(-2y + 5)(y + 3)

A:-2y^2 + 8y + 15
B: -2y^2 - y + 15
C: 2y^2 + 8y + 8
D: 2y^2 - y + 8

Answers

Answer 1
Answer: (-2y + 5 ) ( y+3) 
= -2y^2 -6y +5y +15 
= -2y^2 - y +15 
the answer is B 
Answer 2
Answer:

Answer:

23

Step-by-step explanation:

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A grocer stacks oranges in a four-sided pyramid that is 7 layers high. How many oranges are in the pile? A.504 B.840 C.140 D.120

Answers

Answer:

Option C. 140

Step-by-step explanation:

Base of a pyramid which has four triangular sides is four sided.

If pyramid contains seven layers of oranges then the layer at the bottom will have 7 oranges.

Since base is a square then other side of the square base will have the same number of oranges = 7.

Therefore number of oranges at the first layer will be = 7×7

Similarly other layers above this layer will have the same sequence

6×6, 5×5, 4×4, 3×3, 2×2, 1×1

Therefore total number of oranges = 7×7 + 6×6 + 5×5 + 4×4 + 3×3 + 2×2 + 1×1 = 49 + 36 + 25 + 16 + 9 + 4 + 1 = 140

Option C. 140 is the answer.

A grocer stacks oranges in a four-sided pyramid that is 7 layers high. Many oranges are in the pile are C.140

Further explanation

The orange is the fruit of the citrus species Citrus and sinensis in the family Rutaceae, native to China. Orange is also called sweet orange, to distinguish it from the related Citrus and aurantium, referred to as bitter orange.

The proper name of four-sided pyramid is a "tetrahedron". The tetrahedron has the extra interesting property of having all four triangular sides congruent

1st Layer: The 1st layer contains only 1 orange so it has only 1 orange

2nd layer: The 2nd layer has total 4 oranges. Calculation:   2*2=4

3rd layer: The 3rd layer has total 9 oranges. Calculation: 3 * 3 = 9

4th Layer: The 4th layer has total 16 oranges. Calculation: 4 * 4 = 16.

5th layer: The 5th layer has total 25 oranges. Calculation:  5 * 5 = 25

6th layer: The 6th layer has total 36 oranges. Calculation: 6 * 6 = 36

7th layer: The 7th layer has total 49 oranges. Calculation: 7 * 7 = 49.

Sum of all layers:

1+4+9+16+25+36+49 = 140

Learn more

  1. Learn more about oranges brainly.com/question/10744522
  2. Learn more about pyramid brainly.com/question/10262815
  3. Learn more   about pile brainly.com/question/9094265

Answer details

Grade:  9

Subject:  mathematics

Chapter:  pyramid

Keywords:  oranges, pyramid, four-sided, layers, pile

Your sister is starting 9th grade next year and is thinking about going to college. What step would you recommend she take first?

Answers

Take a placement test and she if the college she want to go to will take someone her age usually Tech school have some programs that will take people at 16 but some might not.
have her score high on standardized tests, research interests, figure out transportation/accommodation once she leaves HS.

1 1/3 minus 5/6 please help me out

Answers

Answer:

17/6

So this is the answer. If you want to convert to decimal... The answer will be 2.83..hope it is right

I need to turn this is tomorrow, the area of the rectangle is 10cm², find the value of x and use it to find the length and the width of the rectangle. The long sides of the rectangle measure 4x+2 and 10x-1. I need a formula please and thank you.

Answers

The formula is
Area=Length ×width
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What is the reflection of the point (-5,2) in the line y=2?

Answers

Answer:

-2/5

Step-by-step explanation:

When you reflect a point across the line y = x, the x-coordinate and y-coordinate change places. If you reflect over the line y = -x, the x-coordinate and y-coordinate change places and are negated (the signs are changed). the line y = x is the point (y, x). the line y = -x is the point (-y, -x).

i am a three digit number. i am divisible by 5. i am an even number each of my digits are different my tens is greater than my ones digit. my hundreds digit is greater than my tens digit. i am less than 400. i am divisible by 3. i have only one odd digit. my tens digit is 1. what number am i?

Answers

Answer:

210

I am divisible by 5.

So your ones digit is 0 or 5

I am an even number.

So your ones digit is 0.  We fill that in.

_ _ 0

My tens digit is 1.

So we fill that in.

_ 1 0

 

My tens digit is greater than my ones digit.

Well, of course 1 is greater than 0. We didn't need to be told that.

I have only one odd digit.

Since the 1 is odd, the hundreds digit is even, 2,4, or 8

I am less than 400.

So your hundreds digit is 2.  Fill that in and we're done.

2 1 0

My hundreds digit is greater than my tens digit.

Of course 2 is greater than 1, we didn't need to be told that.

I am divisible by 3.

Of course 210 is divisible by 3.  We didn't need to be told that.

 

Too much information!

Answer: 210
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