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faltersainse [42]
3 years ago
9

9(a+2)=9 con comprobación plisss!!

Mathematics
1 answer:
icang [17]3 years ago
6 0

Answer:

9a+18=9

9a=-9

a=-1

Step-by-step explanation:

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Help me please please ASAP
marissa [1.9K]

Answer:

22.4

Step-by-step explanation:

6 0
3 years ago
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Can someone please explain how the answer is D
Kitty [74]

Step-by-step explanation:

Because the length of ST is calculated using pythagorean theorem:

{c}^{2}  =  {a}^{2}  +  {b}^{2}

Where the square of the hypotenuse is equal to the sum of squares of the other two sides of a right triangle. In this case, the hypotenuse is ST and the other two sides are distances between S and T over the X and Y axis. Those are easily calculated:

x =  |sx - tx|  \\ y =  |sy - ty|

Where x is the distance between S and T over X axis and Y distance over Y axis, sx and tx are X coordinates of S and T, sy and ty are Y coordinates of S and T.

Using that formula, you get that y = 17 and x = 8.

Back to the pythagorean theorem, if we put those number in the formula of the pythagorean theorem, we get something like this:

{c}^{2}  =  {x}^{2}  +  {y}^{2} \\  {c}^{2}  =  {8}^{2}  +  {17}^{2} = 64 + 289  \\  {c}^{2}  = 353 \\ c =  \sqrt{353}

And finally, the correct answer is in fact 353.

3 0
2 years ago
John's Mathematics exam mark this year is increased by 5% to 84. Find his Mathematics exam mark
Svet_ta [14]

Answer:

80%

Step-by-step explanation:

Let's call the past exam mark m,

m*105%=84

m*105/100=84

m=84/(105/100)

m=80

Hope this helps!

8 0
3 years ago
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Please answer this very simple and easy attachment I will say what each choose is down below! The chooses have 4 options each ex
Bas_tet [7]

Answer:

1st choose: Rounded

2nd Choose: 36

3rd Choose: 6

Step-by-step explanation:

1st  Choose: You want rounded numbers because it makes the problem simpler.

2nd Choose:  35 3/4 rounds to 36.

3rd Choose: 5 7/8 rounds to 6. 36 and 6 divides evenly.

Hopes this helps:)

7 0
2 years ago
What is -7+(-2)? I got nine but I'm not sure if that's correct.
horrorfan [7]
It's actually (-9)... think of it as a hot air balloon, the positivies being balloons and the negatives being sandbags or weights.
You have 7 sandbags/weights and add 9 more sandbags/weights, causing u to go lower, therefore, *negative* 9
Hope that helped! :))
8 0
3 years ago
Read 2 more answers
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