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3 years ago

I need help! Quick please! A. 10 B. 70 C. 85 D. 90

Mathematics

1 answer:

tigry1 [53]3 years ago

8 0

Answer: b:70

Step-by-step explanation:

x^2=100

100 - (2*10 + 2*5 )= 100 - (20 + 10)

100 - 30 = 70

YAY! 70!

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Which statements are true about the ordered pair

Lostsunrise [7]

Answer:

-The ordered pair (-1, 5) is a solution to the first equation because it makes the first equation true.

-The ordered pair (-1, 5) is a solution to the second equation because it makes the second equation true.

-The ordered pair (-1, 5) is a solution to the system because it makes both equations true

Step-by-step explanation:

The correct question is

Which statements are true about the ordered pair (−1, 5) and the system of equations?

x+y=4

x−y=−6

we know that

If a ordered pair is a solution of a equation, then the ordered pair, must satisfy the equation (makes the equation true)

If a ordered pair is a solution of the system of equations, then the ordered pair, must satisfy the equations of the system (makes both equations true)

we have

$x+y=4$ ----> first equation

$x-y=-6$ ----> second equation

step 1

Verify if the ordered pair satisfy the first equation

Substitute the values of x and y of the ordered pair in the first equation

For x=-1, y=5

$-1+5=4$

$4=4$ ---> is true

The ordered pair satisfy the first equation

The ordered pair is a solution to the first equation because it makes the first equation true

step 2

Verify if the ordered pair satisfy the second equation

Substitute the values of x and y of the ordered pair in the second equation

For x=-1, y=5

$-1-5=-6$

$-6=-6$ ---> is true

The ordered pair satisfy the second equation

The ordered pair is a solution to the second equation because it makes the second equation true

therefore

The ordered pair (-1, 5) is a solution to the system because it makes both equations true

6 0

4 years ago

The chance of rain on a randomly selected day in Western Oregon between June 21st and September 21st is 30% each day. What is th

polet [3.4K]

Answer:

0.47 is the probability it rains at least 2 out of any randomly selected 5 days during the given time of year

Step-by-step explanation:

We are given the following information:

We treat training as a success.

P(Rain) = 30% = 0.30

Then the chances of rain on each day follows a binomial distribution, where

$P(X=x) = \binom{n}{x}.p^x.(1-p)^{n-x}$

where n is the total number of observations, x is the number of success, p is the probability of success.

Now, we are given n = 5

We have to evaluate:

$P(x \geq 2) =1- P(x = 0) + P(x = 1) \\=1- \binom{5}{0}(0.3)^0(1-0.3)^5 - \binom{5}{1}(0.3)^1(1-0.3)^4\\=1- 0.16807- 0.36015\\= 0.47178 \approx 0.47$

0.47 is the probability it rains at least 2 out of any randomly selected 5 days during the given time of year

6 0

4 years ago

Which graph shows the function y=(1/3)3x?

sleet_krkn [62]

Answer:

There are no graphs...

Step-by-step explanation:

5 0

3 years ago

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telo118 [61]

26x is the answer hope this helps!

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3 years ago

kami has 7 liters of water to fill water bottles that each hold 2.8 liters. how many bottles did she fill

anzhelika [568]

Answer:

2 & a half bottles

Step-by-step explanation:

kami has 7 liters of water

Now,

each bottle holds 2.8 liters

∴she filled = 7/2.8 bottles

= 2.5 bottles

≈ 3 bottles

6 0

4 years ago

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