AB = Round your answer to the nearest hundredth. B. 20° ? 7 C С А

Mathematics

2 answers:

MrRa [10]3 years ago

8 0

Answer: 8.77

Step-by-step explanation:

AleksAgata [21]3 years ago

6 0

Step-by-step explanation:

A is 20+90+A=180. A=70 (corner)

So the sine of 20 is 0,3420

So we have

Sine of 20 =CA÷7 => CA is 2.3 so you should write 3

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What is the solution set of the system of equations x+y=5 and y=x^2-25

riadik2000 [5.3K]

The solution set is basically when are they equal. to figure this out we must set them equal. So so we will move some stuff around

x+y=5
y=5-x

y=x^2-25

we know that when they are equal their x and y values are equal. So so we know that their y values are the same so we can say:

y=y

this does not direarly help but looking above we know what both of the y's equal. so:

5-x = x^2-25

we want to set this equal to zero

0 = x^2 +x - 30

now we factor

0 = (x + 6) * (x - 5)

the only way to multiply 2 things together and get zero is for one of those things to equal 0. So so we know that to be zero one of the answers in parenthesis has to equal 0. so:

0 = (x + 6 =0) * (x - 5=0)

So now we solve for both parenthesis

x+6=0
x=-6

x-5=0
x=5

x=-6,5

6 0

4 years ago

John’s piggy bank contained 7 dimes and 3 quarters. He pulled out 1 coin without looking. Without replacing the first coin, John

yKpoI14uk [10]

Probability Trees - See linked image

A good visual method for this is a probability tree.

Each set of branches represents the probabilities of on coin being removed, the second set is out of 9 as the first coin is taken and not replaced.
Multiply along the lines to work out the probability of each of the combinations.

*Even though only 'Dime Dime' is needed, it is best to do all of them as this way you are able to get all marks in an exam; you can also add up all the final values as a check to see if you are right.