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prisoha [69]
3 years ago
15

(4, -9) is it a solution yes or no ? ​

Mathematics
2 answers:
ehidna [41]3 years ago
7 0

Answer:

Yes

Step-by-step explanation:

RideAnS [48]3 years ago
3 0

We cannot see the full problem

But go with no

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30 POINTS!! HELP!!! WILLBEMARKEDBRAINLIEST!!
Verizon [17]

Answer:

sophie used the wrong height for the pyramid

Step-by-step explanation:

8 0
3 years ago
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Martin's brother just turned 2 years old.What is his brother's age in months?
madam [21]
24 months. 1 year equals 12 months. 12x2=24
3 0
2 years ago
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For safety reasons, four different alarm systems were installed in the vault containing the safety deposit boxes at a beverly hi
AleksAgata [21]
The probability any one system works is 0.99
So the probability of any one system failing is 1-0.99 = 0.01, so basically a 1% chance of failure for any one system

Multiply out the value 0.01 with itself four times
0.01*0.01*0.01*0.01 = 0.000 000 01
I'm using spaces to make the number more readable
So the probability of all four systems failing is 0.00000001
Subtract this value from 1 to get
1 - 0.00000001 = 0.99999999

The answer is 0.99999999 which is what we'd expect. The probability of at least one of the systems working is very very close to 1 (aka 100%)
7 0
2 years ago
Can you explain step by step for #15 and #16 I have a test on this tomorrow
RUDIKE [14]

Answer:

15.

\left\{\begin{array}{l}x+y=50\\0.2x+0.1y=6\end{array}\right.

16. 10 ml of 20% saline and 40 ml of 10% saline

Step-by-step explanation:

A chemist takes x ml of 20% saline and y ml of 10% saline. In total, he takes

x + y ml that is 50 ml, so

x + y = 50.

There are  0.2x ml of salt in x ml of 20% saline and 0.1y ml of salt in 10% saline. There are 0.12\cdot 50=6 ml of salt in 50 ml of 12% saline. Thus,

0.2x+0.1y=6

15. We get the system of two equations:

\left\{\begin{array}{l}x+y=50\\0.2x+0.1y=6\end{array}\right.

16. Solve this system. From the first equation:

x=50-y

Substitute it into the second equation:

0.2(50-y)+0.1y=6\\ \\10-0.2y+0.1y=6\\ \\-0.1y=6-10\\ \\-0.1y=-4\\ \\y=40\\ \\x=50-y=50-40=10

7 0
2 years ago
Evaluate using order of operations.<br> 9(8 – 11) – 3(-5)
yulyashka [42]

Answer:

-12

Step-by-step explanation:

9(8-11)-3(-5)

First do multiplication.

72-99+15

And then, do the rest of the equation from left to right.

-27+15

Answer that question to get:

-12

Hope this helped! :)

8 0
2 years ago
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