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Oliga [24]
3 years ago
5

(9x+7)(9x-7) what's the answer

Mathematics
2 answers:
MrRa [10]3 years ago
8 0
They cancel each other out because one is + and the other is -.
EastWind [94]3 years ago
4 0

81x^2 - 49. The middle terms cancel out because of the opposing signs, but the answer is 81x^2 - 49

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4+ 10(5-3) + 4 +62 is what <br> 18<br> 42<br> 21<br> 45
LenaWriter [7]

Answer:

18

Step-by-step explanation:

i k

Just todo the test so its tje ansiedad

4 0
2 years ago
Which solid has two bases that are triangles and three lateral surfaces that are rectangles
Amiraneli [1.4K]
A triangular pyramid has 3 rectangular sides and a top and bottom triangular base.
3 0
3 years ago
I really need some help on this question
Leya [2.2K]

Answer:

What is the car's rate in kilometers per minute?

0.9\frac{km}{min}

How many kilometers will the car travel in 5 minutes?

4.5\ km

Step-by-step explanation:

If we know:

\frac{54\ km}{1\ hour}

And there are 60 minutes in an hour:

\frac{1\ hour}{60\ minutes}

We can do:

\frac{54\ km}{1\ hour} * \frac{1\ hour}{60\ minutes} = \frac{54\ km}{60\ minutes} = 0.9 \frac{km}{min}

From here, we figure out the distance from minutes:

0.9\frac{km}{min} * 5 = 4.5\ km

3 0
2 years ago
A physical education class has three times as many girls as boys. During a class basketball game, the girls average 18 points ea
BigorU [14]
Let the number of girls be g and the number of boys be b.
b = 3g
Class average = class score/class size = 17
17 = (class score) / 3g + g
68g = class score
Class score = girls score + boys score
Girls average = girls score/g
girls score = 18g
68g = 18g + boys score
boys score = 50g
Boys average = 50g/3g
= 16.7
4 0
3 years ago
The theme park company is building a scale model of the killer whale stadium main show tank for an investor's presentation. Each
4vir4ik [10]
Well if each dimension is made 6 times smaller and we have 3 dimensions. so we would have to divide each dimension by 6. if we divide each dimension by 6 then we divide by 6 to the third power or 6^3. which is 218 times smaller. so if it was a cube and its actual dimension was 6 x 6 x 6, the volume of this is 218. then each dimension is 6 times smaller. this means divide each by 6 and we get 1 x 1 x 1. the volumenof this is 1 cubic foot. so it would be 218 times smaller.
7 0
3 years ago
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