An isosceles triangle has 2 sides of the same length and one side that's not the same length.

So it says the shortest side, y, is 2.1m, so that means it's the side that is not the same length as the other two sides.

But the other two sides will be the same length. Let's make those 2 sides x.

The equation would be
x + x + 2.1 = 7.5

And with that you can find x.

3 0

3 years ago

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The scores of 1000 students on a standardized test are normally distributed with a mean of 50 and a standard deviation of 5. wha

ra1l [238]

We are looking to find P(X>60 students)

X is normally distributed with mean 50 and standard deviation 5

We need to find the z-score of 60 students
$Z= \frac{60-50}{5}=2$

To find the probability of P(Z>2), we can do 1 - P(Z<2)
So we read the probability when Z<2 which is 0.9772, then subtract from one we get 0.0228

The number of students that has score more than 60 is 0.0228 x 1000 = 228 students

3 0

3 years ago

Will mark brainliest

Lilit [14]

(2x+1)+(3x-5)=5x-4 you just have to try some of them out and see which ones work

5 0

2 years ago