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2 years ago

Solve eqaution 4t+9=-8t-13

1 answer:

3 0

Simple.....

you have:

4t+9=-8t-13

isolate the variable...

4t+9=-8t-13
+8t +8t

12t+9=-13

12t+9=-13
-9 -9

12t=-22

t= $- \frac{11}{6}$

Thus, your answer.

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3 years ago

A certain tennis player makes a successful first serve 6969% of the time. Suppose the tennis player serves 9090 times in a matc

Wewaii [24]

Answer:

a) 4.387

b) Yes, because np & npq are greater than 10.

c) = 0.017

Step-by-step explanation:

Give data:

p = 0.69

n = 90

a) a

E(X) = np = 62.1

$SD(X) = \sqrt{(np(1-p))}$

$=\sqrt{90\times 0.69(1- 0.69)}$

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$= P(Z> \frac{((71.5-62.1)}{ 4.387})$

= P(Z> 2.14 )

= 1 - P(Z<2.14)

= 1 - 0.983 (using table)

= 0.017

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3 years ago