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professor190 [17]
3 years ago
14

What is the answer to 2a-3=7

Mathematics
1 answer:
ladessa [460]3 years ago
5 0
2a−3=7

Add 3 to both sides.

2a−3+3=7+3

2a=10

Divide both sides by 2.

2a / 2 = 10 / 2

a=5

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How is this solved please help anyone
irina [24]

h = 2 \\ 6x + 18 = 2(3x + 9) \\ 6x + 18 = 6x + 18 \\ 18 = 18 \: always \: true
5 0
3 years ago
How many integers between 100 and 999 (inclusive) have distinct digits
daser333 [38]

Answer:

648

Step-by-step explanation:

Running this in Python, with the code as follows,

import math

cur_numbers = [0] * 3

num = 0

for i in range(100, 1000):

   cur_numbers[2] = i % 10

   i = math.floor(i/10)

   cur_numbers[1] = i % 10

   i = math.floor(i/10)

   cur_numbers[0] = i % 10

   if(len(set(cur_numbers)) == 3):

       num += 1

       print(cur_numbers)

       

print(num), we get 648 as our answer.

Another way to solve this is as follows:

There are 9 possibilities for the hundreds digit (1-9). Then, there are 10 possibilities for the tens digit, but we subtract 1 because it can't be the 1 same digit as the hundreds digit. For the ones digit, there are 10 possibilities, but we subtract 1 because it can't be the same as the hundreds digit and another 1 because it can't be the same as the tens digit. Multiplying these out, we have

9 possibilities for the hundreds digit x 9 possibilities for the tens digit x 8 possibilities for the ones digit  = 648

5 0
2 years ago
If 60% of a KNOWN NUMBER is 180, what is the 40% of that UNKNOWN NUMBER?
Lana71 [14]

Step-by-step explanation:

I think you mean you want to find out 40% of a number,, when 60% of it is 180, so I'll answer that:

60% = 180

÷6

10% = 30

x4

40% = 120

(if you want to find 100%, multiply 30 by 10)

Hopefully this helps :)

4 0
2 years ago
Write an expression for the calculation eight minus the sum of five and 43 divided by
notka56 [123]
8 - 5 + 43 / ?

DIvided by??
6 0
3 years ago
Read 2 more answers
Consider the plane, T, and three collinear points (but not coplanar) points P, Q, and W.
Montano1993 [528]

Answer:

vvv dvw

Step-by-step explanation:

dnbvfv nb f

5 0
3 years ago
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