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2 years ago

Could someone help me step by step with this question?

Mathematics

1 answer:

a_sh-v [17]2 years ago

7 0

$\frac{2}{3}(9+x)=-5(4-x) \\ \\ 3*\frac{2}{3}(9+x)=3*[-5(4-x)] \\ \\ 2(9+x)=-15(4-x) \\ \\ 18+2x=-60+15x \\ \\ -13x=-78 \\ \\ \cfrac{-13x}{-13} = \cfrac{-78}{-13} \\ \\ x=6$

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Vernon tossed a coin 20 times. The results were 8 head s and 12 tails. What is the experimental probability of tossing heads?

solmaris [256]

Answer:

2/5

Step-by-step explanation:

The experimental probability is

P (heads) = number of heads/ total tosses

= 8/20

= 2/5

8 0

2 years ago

Find the area of the triangle. Enter your answer in the box. An obtuse triangle. The base of the triangle is fourteen millimeter

Jet001 [13]

Answer:

Step-by-step explanation: Formula to find an area of a triangle A= 1/2base x height

Data

h=12mm A=1/2 base x height

b=14mm. A= 1/2 x (14mm x 12mm)

A=? A= 168mm^2(square) /2

A= 84mm square

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2 years ago

You have a 100 coins laying flat on a table, each with a head side and a tail side. 10 of them are heads up, 90 are tails up. yo

dmitriy555 [2]

I LOVE THIS PUZZLE

so,
the solution is
take 10 coins off to the side
flip those 10 over
done

sounds too simple?

this can be solved with algebra for ANY number of coins
lets say we have 50 coins, all tails
we flip h coins head
if h=x+y
if we seperate h coins off, we get x heads, and y tails
and in the other pile, we have y heads and the rest of the tails
so now, if we flip all the coins, we get y heads in the pile and x tails

solution:
seperate 10 coins and flip all 10 of them over

5 0

2 years ago

draw a graph of y=3×-2 and the line 4 on the SAME paper state the coordinates of the y intercept of y=3×-2 state the coordinates

lukranit [14]

Answer:

(2,4)

Step-by-step explanation:

The y-intercept for y = 3x - 2 (2, 4)

The y-intercept of y = 4 (0, 4)

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2 years ago

What is the value of x?<br><br> Enter your answer in the box.<br><br> x =

juin [17]

Answer:

The answer to your question is: x = 3

Step-by-step explanation:

This is an equilateral triangle so let's work with side AB and AC

6x - 3 = 3x + 6

6x - 3x = 6 + 3

3x = 9

x = 9 / 3

x = 3

6 0

2 years ago