A triangle has sides with lengths of 8 millimeters, 15 millimeters, and 17 millimeters. Is it a right triangle?

Answers

Answer 1
Answer:

Answer:

yes.

Step-by-step explanation:

to find this answer, use the pythagorastheorem.the pythagoras theorem states that a² + b² = c².

to see if this is a right angled triangle, we will use this formula, as the pythagoras theorem only works for right angled triangles.

we are going to work out c, which is always the hypotenuse. the hypotenuse is the longest side of a triangle, that is larger than the other values. we know that the hypotenuse of this triangle is 17, so let’s see if that’s the answer we get.

calculation:

a² + b² = c²

a = 8 millimetres

b = 15 millilitres

c = ?

8² + 15² = c²

64 + 225 = c²

64 + 225 = 289.

289 = c²

√289 = c

√289 = 17.

the pythagoras theorem correctly identified the length of the hypothenuse. as i said earlier, this theorem only works on right angled triangles, therefore, this triangle is right angled.


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What is 1725 with a 15% markup

Answers

\begin{array}{|c|ll} \cline{1-1} \textit{\textit{\LARGE a}\% of \textit{\LARGE b}}\n \cline{1-1} \n \left( \cfrac{\textit{\LARGE a}}{100} \right)\cdot \textit{\LARGE b} \n\n \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{15\% of 1725}}{\left( \cfrac{15}{100} \right)1725}\implies 258.75~\hfill~\underset{ \textit{marked up} }{\stackrel{ 1725~~ + ~~258.75 }{\text{\LARGE 1983.75}}}

Answer:

1983.75

Step-by-step explanation:

What is 1725 with a 15% markup?

15% = 0.15

We take

1725 + (1725 x 0.15) = 1983.75

So, the answer is 1983.75

Find the coordinates for the midpoint of the segment with endpoints given. (5, 6) and (8, 2)

Answers

we first introduce midpoint formula
X1+X2 over 2;Y1+Y2 over 2
5+8 over 2 ; 6+2 over 2
x=13 over 2 ; Y=4
therefore midpoint=(13/4;4)

Deon has 10 bikes if he gave 2 away how much does he have

Answers

8 bikes because say you have 10 fingers and you put 2 fingers down than you would have 8

Evaluate the expression: 6 - |-4| + 3 × |-2|

Answers

The bars with some of the numbers mean the those number MUST be positive.

So: 6 - 4 + 3 x 2 = 2 +6 = 8


6 - 4 + 3 × 2 = 2 + 6 = 8

Find the roots of the equation by completing the square: 3x^2-6x-2=0. Prove your answer by solving by the quadratic formula.

Answers

Calculating delta: 
Δ=b²-4ac
a=3
b=-6
c=-2
Δ=36-4*3*(-2)=36+24=60
√Δ=√60
Delta is positive so there are two roots:
x1=\frac{ -b+ \sqrt[2]{delta} }{2a}
x1=(6+ √(delta) )/(2*3)=(3+ √(15) )/(3)
x2=(3- √(15) )/(3)
3x^2-6x-2=0\n\n(\sqrt3\ x)^2-2\cdot\sqrt3\ x\cdot\sqrt3+(\sqrt3)^2-(\sqrt3)^2-2=0\n\n(\sqrt3\ x-\sqrt3)^2-3-2=0\n\n(\sqrt3\ x-\sqrt3)^2=5\iff\sqrt3\ x-\sqrt3=-\sqrt5\ \vee\ \sqrt3\ x-\sqrt3=\sqrt5\n\n\sqrt3\ x=\sqrt3-\sqrt5\ \vee\ \sqrt3\ x=\sqrt3+\sqrt5\ \ \ \ \ |multiply\ both\ sides\ by\ \sqrt3\n\n3x=3-√(15)\ \vee\ 3x=3+√(15)\ \ \ \ \ \ \ |divide\ both\ sides\ by\ 3\n\nx=(3-√(15))/(3)\ \vee\ x=(3+√(15))/(3)



Prove:\n\n3x^2-6x-2=0\na=3;\ b=-6;\ c=-2\n\Delta=b^2-4ac\to\Delta=(-6)^2-4\cdot3\cdot(-2)=36+24=60\n\nx_1=(-b-\sqrt\Delta)/(2a);\ x_2=(-b+\sqrt\Delta)/(2a)\n\n\sqrt\Delta=√(60)=√(4\cdot15)=\sqrt4\cdot√(15)=2√(15)\n\nx_1=(6-2√(15))/(2\cdot3)=(3-√(15))/(3)\ \vee\ x_2=(6+2√(15))/(2\cdot3)=(3+√(15))/(3)

50 balls are number 1 to 50 and a red dot is painted on those balls that are a multiple of 7. The balls are mixed into a bag and one ball is randomly chosen. What is the probability that the ball is numbered with a multiple of 5 or has a red dot?

Answers

Hello,

The multiples of 7 are 7,14,21,28,35,42,49 : 7 balls
The multiples of 5 are 5,10,15,20,25,30,35,40,45,50 :10 balls
In total there are 50 balls
But there is a commun ball 35

p=(7+10-1)/50=16/50=8/25=0.32