Answer:
No, she is incorrect.
Step-by-step explanation:
First, you want to simplify 2 and 4/9, to do this you will want to multiply 2 times 9, because there are 2 sets of nines, and then add your 4 to that, you should get the answer 2 x 9 = 18 + 4 = 22, and then put that over nine, so 22/9. 22/9 simplified even farther to its decimal answer, which you get by dividing 22 by 9 is 2.444, and 9 divided by 22 is 0.409, and as you can see those are not the same numbers. I hope this helps :)
Answer:
Originally
The number of coins in the first box was
The number of coins in the second box was
Finally
The number of coins in the first box is
The number of coins in the second box is
Step-by-step explanation:
Let
x-----> number of coins in the first box originally
y-----> number of coins in the second box originally
we know that
-----> equation A
-----> equation B
substitute equation A in equation B
Find the value of x
therefore
Originally
The number of coins in the first box was
The number of coins in the second box was
Finally
The number of coins in the first box is
The number of coins in the second box is
The company installs 5000 light bulbs with an average of 500 hours for each bulb. The standard deviation of 100 hours and distribution approximated by a normal curve. The percentage of bulbs that can be expected to last the period of time of less than 690 hours is 97.1%. This will make the answer to be C.
25a. You are given a formula for height and told that the value of "r" in the formula is 19.6. You are asked to find the value of t such that h = 14.7. Substitute the given values and solve for t the way you solve any quadratic equation.
14.7 = 19.6t -4.9t²
4.9t² -19.6t +14.7 = 0 . . . . . put the equation in standard form
4.9(t² -4t +3) = 0 . . . . . . . . . factor out 4.9 to simplify the numbers
(t -1)(t -3) = 0 . . . . . . . . . . .. divide by 4.9 and factor
The solutions to this are ...
t = 1, t = 3
After
1 second, the ball will reach the height of 14.7 meters.
25b. This question asks you to find the value of t that make h = 0.
0 = 19.6t -4.9t² . . . . . . substitute the given numbers
0 = 4.9t(4 -t) . . . . . . . . factor
The solutions to this are ...
t = 0, t = 4
The ball will hit the ground after
4 seconds.
_____
As you can see from the graph below, a graphing calculator can be helpful for solving problems of this sort.
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