Two sides are 3x longer than the shortest side. So, set up your problem like this.
X = unknown length in centimeters
3X = length of two longer sides
1X = length of short side
3x + 3x + 1x = 49
7x = 49
x = 7
So, two longer sides are 21 centimeters each and the short side is 7 centimeters.
21+21+7 = 49
Answer:
20/25
Step-by-step explanation:
Here, we want to calculate the probability that a student who plays an instrument is in band
The number of students who play instruments are;
25
Amongst this,
20 are in a band
So the probability of having a student who plays instrument and is in a band will be;
20/25 = 4/5
Answer: 0.65
Step-by-step explanation:
the probability is high
Forget about the negative sign. First you have to find a least common denominator. This would be 63. Since we had to multiply 9 by 7 to get 63 we have to multiply the numerator (4) by 7. This gives us a new fraction of 36/63. Since we ha e to multiply 21 by 3 to get 63 we have to multiply 19 by 3. This gives us 57. So now we have 36/63 and 57/63. Then we add the negative sign back in making 57/63 -57/63. Now we add them together. Because one has a negative sign and one is positive the number has to be closer to zero. So the answer is -21/63.
