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Ostrovityanka [42]
2 years ago
15

Solve the system of equations for one of the variables x+4y=5 x-4y=5

Mathematics
1 answer:
Pavlova-9 [17]2 years ago
3 0

Answer:

x=5 y=0

Step-by-step explanation:

cancel out the 4y's and then add the x's together. also add the 5s together. 2x = 10, x = 5, and plug it in, and 5 cancels out, leaving y by itself.

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One of the legs of a right triangle measures 8 cm and its hypotenuse measures 14 cm.
Ugo [173]

Answer:

about 11.5 cm.

Step-by-step explanation:

I know the measurement of the other leg is about 11.5 cm. I know because I used the Pythagorean theorem.

a^2+b^2=c^2.

"a" and "b" are the values of the legs of the triangle, while "c" is the measure of the hypotenuse. We know that 8cm is the measure of one of the legs, and 14 cm is a measure of the hypotenuse.

8^2+b^2=14^2 simplified: 64+b^2=196

Then, I subtracted 64 on both sides, so I would have "b" by itself.

b^2=132

Next, I found the square root of both b^2 and 132, so I would find the true value of "b."

b=11.4891252931

So, the measure of the other leg rounded to the nearest tenth is about 11.5.

3 0
3 years ago
Evaluate the expression without using a calculator: log10^3x-2y
Kruka [31]

Answer:

3x-2y

Step-by-step explanation:

log10^(3x-2y)

We know the base is base 10 since it is not written

log10 10^(3x-2y)

The log10 10 cancels

3x-2y

3 0
4 years ago
Read 2 more answers
Summer school classes begin at 8:30 and last for two and a half hours. At what time
Luba_88 [7]

Answer:it ends at 11:00

Step-by-step explanation:8:30+2:30=11:00

7 0
2 years ago
Read 2 more answers
According to the Empirical Rule, what percentage of a normal population falls between 1 standard deviations left of the mean and
svlad2 [7]

Answer:

68% of the data falls within one standard deviation, 95% percent within two standard deviations, and 99.7% within three standard deviations from the mean.

Step-by-step explanation:

6 0
3 years ago
24 decreased by the quotient and of a number 6 is -5
lidiya [134]
24-x/6=-5
I'm not sure if this is correct
7 0
3 years ago
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