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AIhunter2884
12.06.2020 •
Mathematics
1. Get-A-Great-Read Books is adding a new phone line.
The phone company says that the first 3 digits of the
phone number must be $55, but the remaining 4 digits,
where each digit is a digit from 0 through 9, can be
chosen by Get-A-Great-Read Books. How many phone
numbers are possible?
A. 5(94)
B. 53(94)
C. 53(104)
D. 94
E. 104
Solved
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Ответ:
E. 10^4
Step-by-step explanation:
The first 3 digits are fixed.
There are 10 possible numbers (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) for each remaining 4 digits. Therefore, there are 10*10*10*10 = 10^4 ways to fill the last 4 digits, or 10^4 possible phone numbers.
Ответ:
Hi there! :)
If BD = 16 and AC bisects BD, then BC and CD must be equal. Therefore:
BC = CD
2y - 2 = y + 3
Subtract y from both sides and add 2 to both sides:
2y - y = 2 + 3
y = 5
Substitute the value of y into the equation for BC:
BC = 2y - 2
BC = 2(5) - 2
BC = 8
*However, since you were given the total length of BD and the fact that AC is its bisector (splits it in half), you can simply do:
16 / 2 = 8 units.