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Pavel [41]
3 years ago
8

Plz need this ASAP Simplify the following expression. -2/5 / ( 8/7 * -7/8) /-1

Mathematics
1 answer:
Nitella [24]3 years ago
3 0
The simplified answer is -2/5
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scientist needs 120 liters of a 20% acid solution for an experiment. The lab has available a 25% and a 10% solution. How many li
sattari [20]

Answer:

The scientist needs 80 liters of 25% solution and 40 liters of 10% solution.

Step-by-step explanation:

If x is the liters of 25% solution, and y is the liters of 10% solution, then:

x + y = 120

0.25x + 0.10y = 0.20(120)

Solve the system of equations using substitution or elimination.  Using substitution:

0.25x + 0.10(120 − x) = 0.20(120)

0.25x + 12 − 0.10x = 24

0.15x = 12

x = 80

y = 40

The scientist needs 80 liters of 25% solution and 40 liters of 10% solution.

4 0
3 years ago
Please Help I will mark as brainliest
zhannawk [14.2K]

Answer:

A. True

B. True

C. False

D. True

Step-by-step explanation:

A) To find the probability of the letters spelling CAT go to the letter C, then A, and finally T. there is only one sequence that does this, so the numerator will be 1. There are 6 outcomes overall, so the denominator will be 6. The probability of the letters spelling CAT would be 1/6. The answer is true.

B) To find the probability of T being the first letter go to the letter T. All sequences after the letter T will all be included in the answer. TAC and TCA are both possible solutions, this means there are 2 correct outcomes, so 2 is the numerator. Again, there are 6 outcomes overall, so the denominator will be 6. The probability of T being the first letter is 2/6, which is equal to 1/3. The answer is true.

C) To find the probability of A being the first letter go to the letter A. All sequences after the letter A will all be included in the answer. ACT and ATC are both possible solutions, this mean there are 2 correct outcomes, so 2 is the numerator. Again, there are 6 outcomes overall, so the denominator will be 6. The probability of A being the first letter is 2/6. The answer is false.

D) To find how many total outcomes are possible go to the tree diagram and look to the far right. Go down each of the rows to find all of the outcomes, there is T,C,T,A,C, and A. That means there are six possible outcomes. The answer is true.

7 0
3 years ago
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Sergeeva-Olga [200]

Answer:

40/48

Step-by-step explanation:

10*4=40

12*4=48

6 0
3 years ago
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Question 5 20 pts If the radius of a circle is 28 cm, what is the circumference? (Use 3.14 for pi)​
ra1l [238]

Answer:

The circumference of a circle can be found by multiplying pi ( π = 3.14 ) by the diameter of the circle. ... Use 3.14 for pi

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2 years ago
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The area of a square is 144 square centimeters.<br> What is the length of one side of the square?
babunello [35]
What is the length of one side of the square?


ANSWER ---Take the square root of 144.
so it is -------- 12
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