1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Luba_88 [7]
3 years ago
15

Which expression is prime? A) x2 - 9 B) 1 - 9x2 C) 2a2 - 25 D) 4x2 - 9

Mathematics
2 answers:
mel-nik [20]3 years ago
4 0
I think the right anser would be (a)

Luden [163]3 years ago
3 0

Answer:

its c 2a2-25


Step-by-step explanation:


You might be interested in
Common factors of 28 and 40
Nady [450]
28: 1, 2, 4, 7, 14, 28

40: 1, 2, 4, 5, 8, 10, 20, 40

The common factors are 1, 2, and 4.

You can use a factor rainbow to help you find the factors (:
7 0
3 years ago
Find an exponential function that fits the information (hint: putting them in a table may help you see).
Vilka [71]

Answer:

f(x)=8*(3.5)^x

Step-by-step explanation:

2=98

3= 98r

4= 98r^2

5= 98r^3

6= 98r^4

98r^4/98, 98 crosses out and its just r^4. r^4= 14706.125/98

r=3.5

So you plug that in and you get f(x)=8*(3.5)^x

I hope this helped. XD

7 0
3 years ago
Given the directrix of y = 6 and focus of (0, 4), which is the equation of the parabola?\
Yuliya22 [10]

Answer:

The directrix is y=6 and focus is (0,4)

The equation of the parabola is,

20-4y=x²

5 0
3 years ago
Please help with #12
ExtremeBDS [4]

Answer:

a. 1 1/8 b. 8/9

Step-by-step explanation:

You can set this up as a proportion to solve.  For part a. we know that 2/3 of the road is 3/4 mile long.  2/3 + 1/3 = the whole road, so we need how many miles of the road is 1/3 its length.  Set up the proportion like this:

\frac{\frac{2}{3} }{\frac{3}{4} } =\frac{\frac{1}{3} }{x}

Cross multiplying gives you:

\frac{2}{3}x=\frac{1}{3}*\frac{3}{4}

The 3's on the right cancel out nicely, leaving you with

\frac{2}{3}x=\frac{1}{4}

To solve for x, multiply both sides by 3/2:

\frac{3}{2}*\frac{2}{3}x=\frac{1}{4}*\frac{3}{2} gives you

x=\frac{3}{8}

That means that the road is still missing 3/8 of a mile til it's finished.  The length of the road is found by adding the 3/4 to the 3/8:

\frac{3}{4}+\frac{3}{8}=\frac{6}{8}+\frac{3}{8}=\frac{9}{8}

So the road is a total of 1 1/8 miles long.

For b. we need to find out how much of 1 1/8 is 1 mile:

1 mile = x * 9/8 and

x = 8/9.  When 1 mile of the road is completed, that is 8/9 of the total length of the road completed.

8 0
3 years ago
What is the volume of this rectangular prism 5/2 cm 4 cm 1/2
Naily [24]

Answer:

5cm ^{3}

Step-by-step explanation:

v = whl \\  =  \frac{5}{2} \times  \frac{4}{1}   \times  \frac{1}{2}  \\  =  \frac{20}{4}  \\  = 5 {cm}^{3}

7 0
3 years ago
Other questions:
  • Please answer photo below thank you :’)
    12·2 answers
  • julia can finish a 20-mile bike ride in 1.2 hours. katie can finish the same bike ride in 1.6 hours. how much faster does julia
    7·2 answers
  • 5x^2-23x+12<br>this is the question im stuck on
    9·1 answer
  • 17. Find the length of the midsegment XY.
    6·1 answer
  • A statistical test is conducted to see if there is evidence that the proportion of US citizens who can name the capital city of
    10·1 answer
  • Define the six trigonometric functions in terms of x and y
    14·1 answer
  • Which of the following is not a correct factorization of the binomial 10x2 + 40x ?
    13·1 answer
  • Is ^ABC -^DEF explain
    13·2 answers
  • Find the area of the figures. Tried so many times but the answer I'm getting is 20.5 when it's not the correct answer. It would
    12·1 answer
  • Colby worked three more hours
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!