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3 years ago

Please help me with these two questions. And can you tell me how to do this! Thanks you

Mathematics

2 answers:

KiRa [710]3 years ago

6 0

(x-10)(x-10) = (x-10)^2 so in this case just you need to know formula of

(a-b)^2 = a^2 -2ab +b^2

use please this and so will get the right answer sure

Vaselesa [24]3 years ago

5 0

(X-10)(X-10) You need to first multiply out the brackets. So, first times X by X, which makes x^2 . Then do -10 x -10 which makes 100. You then need to multiply the X within the first bracket with the minus 10 in the second bracket which makes -10x. Do the same but with the -10 from the first bracket and the X from the second which again makes -10x. So altogether you have x^2-10x-10x+100. This can be simplified down to x^2-20x+100. You then do the same thing for the second question :)

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ELEMENTARY SCHOOL MATHEMATICS 5+3 pts

valentina_108 [34]

A- 98+89+123=310 (boys)
A-102+105+117=324 (girls)

B-324-310=14 I found my answer by subtracting the girls from the boys and I got 14

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8 0

3 years ago

The life, in years, of a certain type of electrical switch has an exponential distribution with an average life β=44. If 100 o

Bond [772]

Answer:

0.9999

Step-by-step explanation:

Let X be the random variable that measures the time that a switch will survive.

If X has an exponential distribution with an average life β=44, then the probability that a switch will survive less than n years is given by

$\bf P(X$

So, the probability that a switch fails in the first year is

$\bf P(X$

Now we have 100 of these switches installed in different systems, and let Y be the random variable that measures the the probability that exactly k switches will fail in the first year.

Y can be modeled with a binomial distribution where the probability of “success” (failure of a switch) equals 0.0225 and

$\bf P(Y=k)=\binom{100}{k}(0.02247)^k(1-0.02247)^{100-k}$

where

$\bf \binom{100}{k}$ equals combinations of 100 taken k at a time.

The probability that at most 15 fail during the first year is

$\bf \sum_{k=0}^{15}\binom{100}{k}(0.02247)^k(1-0.02247)^{100-k}=0.9999$

3 0

3 years ago

Antione swam 42 laps in 7 minutes. Frank swam 48 laps in 8 minutes. Are

makkiz [27]

9514 1404 393

Answer:

Yes, these rates are equivalent because the unit rate of 6 laps per minute matches each rate.

Step-by-step explanation:

In each case we have ...

laps/minutes = (42 laps)/(7 minutes) = 6 laps/minute = (48 laps)/(8 minutes)

Yes, the rates are both 6 laps/min, so are equivalent.

8 0

3 years ago

Can some one help me with this please and thank you

jeka57 [31]

Lets hope i'm right.

Triangle formula: 1 / 2 b x h

Half one of them. Lets do 4 since 5 would result in a decimal.

(4) = 2 x 5 = 10.

y (10) + 1 = 11

Half one.

(2) = 1 x 3 = 3

Answers:

y = 11

x = 3

Hope this helps! Wait for another answer to make sure i'm right. ;) ~Pooch ♥

6 0

3 years ago

a shopkeeper had purchased 400 products for $40 each the goods did not sell due to quality issues he sold them to a scrap dealer

Ratling [72]

Answer:

6500-40=6460

Step-by-step explanation:

7 0

3 years ago