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3 years ago

Help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Mathematics

2 answers:

DIA [1.3K]3 years ago

8 0

Answer:

x = 3

Step-by-step explanation:

4 (x - 1 ) + 4x -1 = 19

solve the brackets first

4x - 4 + 4x -1 = 19

4x + 4x -4 -1 = 19

8x -5 = 19

8x = 19+5

8x = 24

x = 24/8

x = 3

grandymaker [24]3 years ago

3 0

Answer:

x=3

Step-by-step explanation:

I suggest getting this app called photo math, it will help you soo much.

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A chemical company makes two brands of antifreeze the first brand contains 65% pure antifreeze and the second brand contains 80%

liq [111]

Answer:

30 gallons of each brand

Step-by-step explanation:

1 gallon of 60% + 1 gallon of 80% = 2 gallons 70% (60/2 = 30)

8 0

3 years ago

If (x - 3) represents the side of a cube, what is the<br>polynomial that represents its volume?

hichkok12 [17]

Answer:

x³ - 9x² + 27x - 27

Step-by-step explanation:

The volume (V) of a cube is calculated as

V = s³ ( s is the measure of the side ) , thus

V = (x - 3)³

= (x - 3)(x - 3)(x - 3) ← expand the second/ third factors using FOIL

= (x - 3)(x² - 6x + 9) ← distribute

= x³ - 6x² + 9x - 3x² + 18x - 27 ← collect like terms

= x³ - 9x² + 27x - 27

3 0

3 years ago

Watch help video

Marina86 [1]

Answer:

Irrational because it is a decimal that doesn´t repeat or terminate

Step-by-step explanation:

7 0

3 years ago

Triangles A and B have vertical heights x cm and (x+3) cm respectively. The areas of Triangles A and B are 30cm² and 32cm² respe

PolarNik [594]

Answer:

Hi,

Step-by-step explanation:

Let say a the base of the triangle A and b the base of the triangle B.

$a)\\\left\{\begin{array}{ccc}\dfrac{a*x}{2}&=&30\\\dfrac{b*(x+3)}{2}&=&32\\b=a-4\\\end{arraqy}\right.\\\\(i): a=\dfrac{60}{x}\\\\(ii): b=\dfrac{64}{x+3}\\\\b)\\\dfrac{64}{x+3}=\dfrac{60}{x}-4\\\\64x=(60-4x)*(x+3)\\\\4x^2+16x-180=0\\\\x^2+4x-45=0\\\\\Delta=16+4*45=196=14^2\\x=\dfrac{-4+14}{2}=5\ or\ x=\dfrac{-4-14}{2}=-9\ (impossible)\\So\ x=5,\ a=\dfrac{60}{5}=12, b=\dfrac{64}{5+3}=8\\\\Area\ of\ A=12*5/2=30\\Area\ of\ B=8*8/2=32\\\\Height\ of\ triangle\ B=x+3=5+3=8.\\$

3 0

2 years ago

A positive number exceeds four times its reciprocal by 3.<br> Find the number.

Gennadij [26K]

Answer:

the same

Step-by-step explanation:

because the binomial and trinomial is the same

4 0

3 years ago