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Artyom0805 [142]
3 years ago
9

What property is -2.1×1= -2.1 ?

Mathematics
1 answer:
3241004551 [841]3 years ago
8 0
Multiplicative Identity Property.

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Tracy is running in a 5.25-kilometer race on Saturday. A marathon is approximately 42 kilometers. How many time as long as Tracy
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Answer:

i needed points sorry

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3 years ago
For safety reasons, 4 different alarm systems were installed in the vault containing the safety deposit boxes at a Beverly Hills
Evgen [1.6K]

Answer:

<em>99.93%</em>

Step-by-step explanation:

<u>Probability of Independent Events</u>

Given the probability of success of each detector is 0.84 independently of the others, their combined success/failure probability can be computed with the product rule.

We can calculate the required probability by using the binomial distribution, but it's easier to calculate the probability of the negated event an subtract from 1.

We want to know the probability that a least one of the 4 systems detects the occurrence of theft. That probability is the sum of the probabilities that one of them, two of them, three of them or all of them succeed. The negated event is that NONE of them actually detects the theft. Being p the individual probability of success, p=0.84. Being q the probability of failure, q=0.16.

The probability that none of the systems detect the theft is

P(0)=q^4=0.16^4=0.00065536

Thus, the probability that at least one of the systems detect the theft is

P(x\geq1)=1-P(0)=1-0.00065536=0.9993

That means a 99.93%

3 0
2 years ago
Sage and Tom started the month with the same number of talk minutes on their cell phones. Sage talked for 7 minutes with her dad
Paraphin [41]

Answer:

a. Sage and Tom have the same number of talk minutes left on their cell phone plans.

b. y = x - 7

Explanation:

Sage talked for 7 minutes with her dad.

Tom talked for 4 minutes with a friend and 3 more minutes with his mom which means he spoke for :

= 4 + 3

= 7 minutes

They both spoke for 7 minutes and therefore have the same amount of time left.

Algebraic expression:

Assuming the time Tom started with is denoted by x and the time he is left with is denoted by y.

The expression is:

y = x - 7

6 0
2 years ago
Which expressions show how 6 • 45 can be rewritten using the distributive property? Choose all answers that are correct.
Karolina [17]
The answer is a and c
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3 years ago
Are these triangles SSS congruent??
Nadya [2.5K]

Answer:

no

Step-by-step explanation:

the sides do not have the same measurments which is required of the SSS postulate

7 0
2 years ago
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