15 (d) A boat travels from C to A at an average speed of x m/s.
A second boat travels from B to A at an average speed 1 m/s faster than the first boat.
It takes the first boat 1 minute longer to reach A than the second boat.
Write down an equation in x and show that it simplifies to x2 - 4x - 30 = 0.
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what are you doing do you need examples of variable questions?

step-by-step explanation:

5a-1=9               bring the one over the =

5a=10                     divide by your variable

a=2

brainliest? ?

here try this one

3a-24=0

any of them that add up to 180 degrees.

alright so i think for this one it would to draw it out. this may be hard for me to try and draw, but i will do my best on here:

        r

  /       |     \

notice how it forms 2 triangles inside one bigger triangle.

so if we know the angle spr is the same as psr that is saying the measure of angle p is the same as angle s. this means the big triangle psr is either isosceles or equilateral. in both cases, the triangle is perfectly symmetrical when split down the middle, which is in this case rq. because we know it is perfectly symmetrical on both sides, we know that the two triangles inside the bigger one are equal.