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kirill115 [55]
3 years ago
6

A team of students lined up dominoes on the gym floor. 90 dominoes fell over and 10 are still standing. What percentage of the d

ominoes fell over?
Mathematics
2 answers:
mr Goodwill [35]3 years ago
7 0

Answer:

oops its 90%

Step-by-step explanation:

djyliett [7]3 years ago
4 0

Answer:

90%

Step-by-step explanation:

90+10 is 100 and if you think about like a fraction when you split up 100 into ten parts it makes ten of ten. 9/10 is equal to 90%

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What is the value of 2x squared plus 3x - 5 when x equals negative 2
7nadin3 [17]

Answer: -3

Step-by-step explanation:

i used a graphing calculator

4 0
3 years ago
find the area of the isocele triangle formed by the points of intersection of parabolas y=-x^2+9 and y=2x^2-3 and the origin
leonid [27]

Answer:

10\ \text{sq. units}

Step-by-step explanation:

The parabola's are

y=-x^2+9

y=2x^2-3

So

-x^2+9=2x^2-3\\\Rightarrow 12=3x^2\\\Rightarrow \\\Rightarrow x=\sqrt{\dfrac{12}{3}}\\\Rightarrow x=\pm 2

y=-x^2+9=-(2)^2+9\\\Rightarrow y=5

y=-(-2)^2+9=5

So, the points at which the parabola's intersect each other is (2,5) and (-2,5)

The three points of the triangle are (2,5), (-2,5) and (0,0)

Area of a triangle is given by

A=\dfrac{1}{2}[x_1(y_2-y_3) + x_2(y_3-y_1) + x_3(y_1-y_2)]\\\Rightarrow A=\dfrac{1}{2}[2(5-0)+(-2)(0-5)+0(5-5)]\\\Rightarrow A=10\ \text{sq. units}

Area of the triangle formed is 10\ \text{sq. units}.

3 0
3 years ago
A is supplementary to B. If A = 55 degrees, then what is the measurement of B?
pickupchik [31]
Since a is supplementary to b, their sum is 180*.
m55+b=180
-55 -55
b=125*
3 0
2 years ago
Read 2 more answers
What are the Lines of symmetry?
TEA [102]

Answer:

Step-by-step explanation:

7 0
3 years ago
I NEED HELP FAST what is y+1=5/6(x-2) in standard form?
Irina18 [472]

Answer:

\large\boxed{5x-6y=16}

Step-by-step explanation:

The standard form of an equation of a line:

Ax+By=C

We have the equation in the point-slope form. Convert:

y+1=\dfrac{5}{6}(x-2)\qquad\text{multiply both sides by 6}\\\\6y+6=6\!\!\!\!\diagup^1\cdot\dfrac{5}{6\!\!\!\!\diagup_1}(x-2)\\\\6y+6=5(x-2)\qquad\text{use the distributive property}\\\\6y+6=(5)(x)+(5)(-2)\\\\6y+6=5x-10\qquad\text{subtract 6 from both sides}\\\\6y+6-6=5x-10-6\\\\6y=5x-16\qquad\text{subtract}\ 5x\ \text{from both sides}\\\\-5x+6y=5x-5x-16\\\\-5x+6y=-16\qquad\text{change the signs}\\\\\boxed{5x-6y=16}

6 0
3 years ago
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