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Ad libitum [116K]
3 years ago
11

Please answer this question ASAP.

Mathematics
1 answer:
Rudiy273 years ago
8 0

Let c = angle TPS

This angle adds to angle 'a' to get a+c = 90. We know these angles are complementary because triangle PQR is a right triangle. The acute angles of a right triangle add to 90.

We also know that b+c = 90 for similar reasons. Triangle PST is a right triangle.

So we have these two equations

a+c = 90

b+c = 90

If we were to subtract straight down then we would end up with

a-b = 0

which solves to

a = b

after adding b to both sides

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Assume that when adults with smartphones are randomly​ selected, 61% use them in meetings or classes. If 8 adult smartphone user
podryga [215]

Answer:

0.1147

Step-by-step explanation:

When adults with smartphones are randomly​ selected, 61% use them in meetings or classes, then

  • the probability of using the smartphone is p=0.61;
  • the probability of not using the smartphone is q=1-p=1-0.61=0.39.

If 8 adult smartphone users are randomly​ selected, the probability that exactly 3 of them use their smartphones in meetings or classes can be calculated using binomial distribution as

C^8_3\cdot p^3\cdot q^{8-3}=C^8_3\cdot (0.61)^3\cdot (0.39)^5

Note that

C^8_3=\dfrac{8!}{3!(8-3)!}=\dfrac{5!\cdot 6\cdot 7\cdot 8}{2\cdot 3\cdot 5!}=\dfrac{6\cdot 7\cdot 8}{2\cdot 3}=7\cdot 8=56,

then the probabilty is

56\cdot (0.61)^3\cdot (0.39)^5\approx 0.1147

8 0
3 years ago
Mr. Smith is building a detention room for students who like to throw spaghetti pieces in class. So he finds 3 areas and he is w
nikdorinn [45]

Answer:

32

Step-by-step explanation:

5 0
3 years ago
What is the y - intercept of EACH line?<br> Line 1<br> Line 2<br> ( will give brainliest)
Dvinal [7]

Step-by-step explanation:

The y-intercept is the value where the line crosses the y-axis.

y-intercept of Line 1 (blue) = 4.

y-intercept of Line 2 (red) = 1.

5 0
3 years ago
A pipe leaks 8 gallons of water every hour how many pints does the pipe leak in one minute
Trava [24]

6.4 pints a minuet. this is the answer because 8 gallons is 64 pints, there are 60 minuets in an hour so 64/60 is 6.4 pints.

4 0
4 years ago
Solving radical equations
My name is Ann [436]

Answer:

  • top: no solution
  • bottom: x = 7

Step-by-step explanation:

I find a graphing calculator very helpful to solving radical equations. It helps avoid extraneous solutions.

<u>top</u>

  √(-14x +2) = x -3

  -14x +2 = x² -6x +9 . . . . . square both sides

  x² +8x +7 = 0 . . . . . . . . . .subtract the left side

Descartes' rule of signs tells you this has no positive real solutions. (There are no sign changes among the coefficients.) The value of the radical will be non-negative, so we must have x-3≥0, or x≥3. Since there are no positive real solutions to the quadratic, there are no values of x≥3 that will satisfy the equation. NO SOLUTION

__

<u>bottom</u>

  4√(x -3) = 8 . . . . . given

  √(x -3) = 2 . . . . . . divide by 4

  x -3 = 4 . . . . . . . . . square both sides

  x = 7 . . . . . . . . . . . add 3

3 0
4 years ago
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