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3 years ago

Simplify the expressions. Show your work.

Mathematics

1 answer:

Hunter-Best [27]3 years ago

5 0

7) Use distributive property
3x(4x⁴ - 5x)=3x*4x⁴- 3x*5x = 12x⁵ - 15x²
8) When you open parenthesis with minus sigh in front of it, you need change sings of the terms on opposite. Then find like terms.
(5x⁴-3x³+6x)-(3x³+11x²-8x)= 5x⁴-3x³+6x -3x³-11x²+8x =5x⁴-6x³ - 11x²+14x
9)(x-2)(3x-4)=x*3x-4x-6x+8=3x²-10x+8
10) (x+6)²=(x+6)(x+6)=x²+6x+6x+36=x²+12x+36
For (x+6)², you can also use the formula of the perfect square
(a+b)²=a²+2ab+b²
For (x+6)² =x²+2*x*6 +6²=x²+12x+36

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It takes Bert 30 minutes longer to mow a rectangular lawn that measures 30 feet by 25 feet than it takes him to mow a rectangula

nevsk [136]

Answer:

C: 70 Mins

Step-by-step explanation:

1, 20ft*15ft=300ft^2

2, 30ft*25ft=750ft^2

3, 750ft-350ft=450ft^2

4, 450 ft^2 = 30 mins

5, 350ft=750ft=1050ft^2

6, 1050/450=2.3333

7, 30*2.3333=70

8, 70 mins

4 0

2 years ago

F(-2)=15, F(1)=9 can someone help me please

pogonyaev

Answer:

y= -2x +11

Step-by-step explanation:

the 2 points: (-2,15) and (1,9)

find the slope: 6/ -3 = -2

find y-intercept: 9 = -2 + b b=11

4 0

2 years ago

What is the Pythagorean’s Theorem ?

mr Goodwill [35]

A^2 + b^ = c^2

c is the longest side of the triangle
a and b are the other two sides

So the given are the hypotenuse leg, and one of the other legs

So
a= ?
b= 12
c= 14

a^2+12^2=14^2

a^2+144=196
-144 -144

a^2=52

So we find the square root of 52

Which is 7.211 which you can round to 7.21 or 7.2

4 0

2 years ago

How many movies are 120 minutes or less in length?

borishaifa [10]

The movies of 120 min or less than 120 mins are 100

Further explanation:

A histogram is a visual representation of data.

In the given histogram we can see that

5 movies are 0 to 30 minutes, 10 movies are 31 to 60 minutes, 30 movies are 61 to 90 minutes, 55 movies are 91 to 120 minutes, and 15 movies are over 120 minutes.

In order to find the number of movies which are 120 minutes long or less than 120 minutes we will add up all the number of movies with 120 length and less than that

So,

$No.\ of\ movies\ 120\ min\ long\ or\ less\ than\ that = 5+10+30+55\\=100\ movies$

The movies of 120 min or less than 120 mins are 100

Keywords: Histogram, reading histograms

Learn more about histograms at:

#LearnwithBrainly

6 0

2 years ago

9. The formula V = wh is the volume formula for a rectangular prism. Find the length

Lelu [443]

Answer c 10cm
good luck

4 0

3 years ago