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icang [17]
3 years ago
11

If you have 18 questions how many do you need to get right to have 50 percent correct

Mathematics
1 answer:
MrRa [10]3 years ago
5 0
You would need exactly 9 correct questions to get a 50%.

We can find this by multiplying the total number of questions by the percentage we are looking for. 

18*50% = 9
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Finish the polynomial by adding one number to make it a perfect square<br><br> x^2+18x+
dsp73

Answer:

81

Step-by-step explanation:

{x}^{2}  + 18x + {(( \frac{1}{2})(18)) }^{2}

{x}^{2}  + 18x +  {9}^{2}

{x}^{2}  + 18x + 81

{(x + 9)}^{2}

6 0
2 years ago
I need help!!
netineya [11]

Answer:

2x +21

Step-by-step explanation:

log_{5} {5}^{(2x - 9)}   +  log_{3} {729}^{5}   \\  \\  =  log_{5} {5}^{(2x - 9)}   +  log_{3} {( {3}^{6} )}^{5}   \\  \\  =  log_{5} {5}^{(2x - 9)}   +  log_{3} { {3}}^{6 \times 5}   \\  \\  =  log_{5} {5}^{(2x - 9)}   +  log_{3} { {3}}^{30}    \\  \\ =(2x - 9)  log_{5} {5} + 30 log_{3} { {3}}   \\  \\  = (2x - 9).1 + 30(1 )\\ ( \because \: log_{a} { {a}}    = 1) \\  \\  = 2x - 9 + 30 \\  \\  = 2x +21

7 0
3 years ago
The perimeter of a certain is 4 yards. find the area of the square in square feet.
Phoenix [80]
1 yard=3 feet
4yards= 4•3= 12 feet

Perimeter of a square = 4•side = 12 so side of the square is 3 feet

Area of square = 3•3=9 Square feet
4 0
3 years ago
JK has endpoints at J(5,9) and K(7, 7). Find the midpoint M of JK.
Basile [38]

Answer:

J (7, 10)

K (3, 2)

Formula for midpoint:

x - coordinate for M:

y - coordinate for M:

Therefore, M (5,6).

Hope this helps :)

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
one number is 7 times a first number. A third number is 100 more than the first number. If the sum of the three numbers is 307,
Svetach [21]
The three numbers are 23, 161, and 123.
6 0
3 years ago
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