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Dennis_Churaev [7]
3 years ago
9

A boy is 6 years older than his sister. In three years time he will be twice her age. What

Mathematics
1 answer:
Masja [62]3 years ago
3 0

Answer:

12 years old

18-6=12

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John earns x dollas per hour. petra earn 2 dollars per hour more than him. How much do they earn altogether per hour?
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2x + 2 dollars, because you're adding x and x + 2
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3 years ago
A straight slide in a playground design makes an isosceles triangle with the
julia-pushkina [17]

Answer:

Option D.

Step-by-step explanation:

  • First, the you need ti understand that the triangle is an isosceles right angled triangle. In other words, the base and height are equal in length. The third side is the slide. This is the longest side.
  • Next, we know that the formula for calculating the area of a right angled triangle is given by:

        A = 1/2 (base × perpendicular height)

  • The perpendicular height is equal to the base. Let's say the base is <em>x</em>. It means that the height is also x, since height = base.
  • Therefore, the formula will be:

       A = 1/2 (x.x)

           =1/2 (x²)

      32 = 1/2 (x²)

     Multiplying both sides by 2 gives:

     32×2 = x²

     64  = x²

       8   = x

To find the third side, we use the Pythagoras theorem:

    C² = A² + B²

         = 8² + 8²

         = 128

   C = √128

       = 8√2

However, the answer will not be exact, so we  multiply the length of the base and height by 2. This gives x = 16 (Length of base = length of height)

Repeating the steps above gives C = √ (16)² + (16)²

                                                           = √256

This corresponds to option D.

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Please only answer if you 100% sure! Giving brainliest!!
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Hope this helps you have a great day!!!!!!
3 0
3 years ago
Read 2 more answers
What is the distributive property of 5(12x -3) -7(2x +1)
Fed [463]

Answer:

46x-22

Step-by-step explanation:

5(12x-3)-7(2x+1)

60x-15-14x-7

60x-14x-15-7

46x-15-7

46x-22

8 0
4 years ago
Read 2 more answers
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