So, I have 3 questions I need help with that I don't really understand 1. In an alloy, copper and zinc are mixed in the ratio 5:3 by weight. If the weight of a block of the alloy is 4.8kg, find the weight of copper in it.

2. The numbers of clerical and technical staff in a company are in the ratio 2:5. If the total number of staff in the company is 28, how many of them are technical staff?

3. In a solution, water and alcohol are mixed in the ratio 4:1 by volume. Find the amount of alcohol in 750 cubic centimeters of the solution.

Will give brainliest for the correct answer, thanks for the help!

  5.   y=6; de=7; fg=8

  6.   x=4.2; jl=14.2; mn=13

step-by-step explanation:

when chords cross inside a circle, the product of the segment lengths is a constant.

5. dh×eh = fh×gh

  y = gh = dh×eh/fh = 3×4/2 . . . divide by the coefficient of gh

  y = 6

of course, the total chord length is the sum of the lengths of its segments.

  de = dh +eh = 3+4 = 7

  fg = fh +gh = 2+6 = 8

6. this problem works the same way as the previous one.

  x = lk = mk×nk/jk = 6×7/10 = 4.2

  jl = jk +lk = 10 +4.2 = 14.2

  mn = mk +nk = 6 +7 = 13

comment on chords and secants

you can think of the points h (problem 5) and k (problem 6) as points where the chords meet. a chord is part of a secant line, a line that intersects the circle in two points. one can also consider these points (h or k) to be the points where the respective secant lines meet.

then, the product that is a constant is the product of the distance from the meeting point (h or k) to one circle intersection with the distance from that meeting point to the other circle intersection. for problem 5, the constant is the product hd×he = hf×hg.

it turns out that this rule regarding the products of lengths to points of intersection is also true when the secants intersect outside the circle.

that is, you only need to remember one rule to work both kinds of problems.

50-38=12

step-by-step explanation:

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answer: d.) the total number of protons and neutrons is 15

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