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dexar [7]
2 years ago
11

Which expression is equivalent to 81-16x^2

Mathematics
1 answer:
iris [78.8K]2 years ago
4 0
Is should be (9-4x)•(9+4x)
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Which dimensions can create more than one triangle? A. Three angles measuring 75°,45°, and 60°. B. 3 sides measuring 7, 10, 12?
NeTakaya

This is vague.  Any dimensions that make a triangle can make more than one, just draw another right next to it.  What's really being asked is which dimensions can make more than one non-congruent triangle.

<span>A. Three angles measuring 75°,45°, and 60°.

That's three angles, and 75+45+60 = 180, so it's a legit triangle. The angles don't determine the sides, so we have whole family of similar triangles with these dimensions.  TRUE

<span>B. 3 sides measuring 7, 10, 12?

</span>Three sides determine the triangles size and shape uniquely; FALSE

<em>C. Three angles measuring 40</em></span><span><em>°</em></span><em>, 50°</em><span><em>, and 60°? </em>

40+50+60=150, no such triangle exists.  FALSE

<em>D. 3 sides measuring 3,4,and 5</em>

Again, three sides uniquely determine a triangle's size and shape;  FALSE


</span>
7 0
3 years ago
Read 2 more answers
Find the domain of f(x)= 10x+1 / 8x + 3 and put it in interval notation?
vesna_86 [32]

f(x) = \frac{10x + 1}{8x + 3}

8x + 3 ≠ 0

8x      ≠ -3

\frac{8x}{8} \neq \frac{-3}{8}

   x ≠ \frac{-3}{8}

Interval Notation: (∞,  \frac{-3}{8}) U ( \frac{-3}{8}, ∞)

4 0
2 years ago
Read 2 more answers
What is 5 time 5 plus 8?
Alex787 [66]

Answer:

33

Step-by-step explanation:

PEMDAS

Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction.

5x5 = 25

25+8 = 33

4 0
3 years ago
Read 2 more answers
Find the area and perimeter of compound shape. Please help
Mekhanik [1.2K]

Answer:

A=140m² and P=54m

Step-by-step explanation:

In order to find the perimeter or area, we are going to first need to find the lenghts of the missing sides. There are two of them, we are going to refer to one as the shorter one and the other as the longer one.

Shorter One = 12-8

Shorter One = 4

Longer One = 15-5

Longer One = 10

From this we can then add the side lengths to find the perimeter of the figure.

Perimeter=5+15+12+8+4+10

Perimeter=20+20+14

Perimeter=54

The perimeter of the figure is 54m, therefore we can eliminate two of the answer choices.

Next, we need to find the area of the figure. The easiest way is to cut the figure into two pieces, I chose to do it by cutting a long rectangle, and then add their areas together.

A=(5*12)+(10*8)

A=60+80

A=140

Therefore the correct answer choice is A=140m² and P=54m

5 0
3 years ago
What is the value of the expression m^2 + 3m when m=4
givi [52]
4^2+3(4)=28 hope this helps
3 0
3 years ago
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