2 years ago

Help please Which number sentence below matches this word problem?

Mathematics

1 answer:

Ostrovityanka [42]2 years ago

4 0

Answer:

I think it's d

Step-by-step explanation:

Nit 100% sure but if nit its b

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The midpoint QR is M (-1,2). One endpoint is R (3,4). Find the coordinates of the other endpoint.

butalik [34]

M = (x₁ + x₂)/2 , (y₁ + y₂)/2

(-1, 2) = $\frac{3 + x}{2} , \frac{4 + x}{2}$

At this point, it is easier to separate the x's and y's into two different equations:

x's: -1 = $\frac{3 + x}{2}$

-2 = 3 + x

-5 = x

y's: 2 = $\frac{4 + x}{2}$

4 = 4 + x

0 = x

Answer: (-5, 0)

7 0

3 years ago

A sample of 100 wood and 100 graphite tennis rackets are taken from the warehouse. if 13 wood and 10 graphite are defective and

Nimfa-mama [501]

Let's split the problem in non-intersecting subsets: we have $87$ good wood racquets, $13$ defective wood rackets, $90$ good graphite racquets, $10$ defective graphite rackets.

The probability that the racket is wood or defective covers the following subsets: good wood, defective wood and defective graphite, which have, respectively, $87$ , $13$ and $10$ elements.

Since the total is $200$ elements, the probability is