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
yuradex [85]
3 years ago
8

4. Evaluate the expression for the given value of each variable.

Mathematics
1 answer:
Novosadov [1.4K]3 years ago
5 0

Answer:

-18

Step-by-step explanation:

5a2-7-b3

5*a*2-7-b*3

5\cdot \left(-2\right)\cdot \left(2\right)-7-\left(-3\right)\cdot 3

Therefore, -18 is your answer.

Hope this helped! :)

You might be interested in
How to find an equation for a line through two given points?​
xz_007 [3.2K]

Answer:

The equation of the line is: y = 0.6x + 0.6

Step-by-step explanation:

Equation of a line:

The equation of a line has the following format:

y = mx + b

In which m is the slope and b is the y-intercept.

Two points:

We have these following two points in this exercise:

x = -6, y = -3, so (-6,-3)

x = 4, y = 3, so (4,3)

Finding the slope:

Given two points, the slope is given by the change in y divided by the change in x.

Change in y: 3 - (-3) = 3 + 3 = 6

Change in x: 4 - (-6) = 4 + 6 = 10

So

m = \frac{6}{10} = 0.6

Then

y = 0.6x + b

Finding b:

We replace one of the points in the equation to find b. I will use (4,3).

y = 0.6x + b

3 = 0.6*4 + b

2.4 + b = 3

b = 0.6

The equation of the line is: y = 0.6x + 0.6

4 0
3 years ago
(3a+7)+(a-1)<br> How do you find the sum of the two binomials
Shkiper50 [21]
3a squared +4a-7 squared is a 2 btw
5 0
3 years ago
4x^2-21x-18=0<br> Find the discriminate
SpyIntel [72]

a = 4, b = -21, c = -18

to keep from getting "mixed up", evaluate the discriminant first ...

b<sup>2</sup> - 4ac = (-21)<sup>2</sup> - 4(4)(-18) = 729

sqrt(729) = 27

x = (21 +/- 27)/8

x = -3/4, x = 6

since the discriminant is a perfect square, the original quadratic will factor ...

4x<sup>2</sup> - 21x - 18 = 0

(4x + 3)(x - 6) = 0

x = -3/4, x = 6

6 0
2 years ago
Read 2 more answers
Simplify: 3x^2-8x+4 and show work please
Bad White [126]

believe what you're asking is to turn the trinomial into two binomials

So you first have to get 3x²; the only way to get this is

(3x    )(x     )     when multiplying that, you would get 3x²

when dealing with the -8x and the 4, you must find numbers that are factors of four (when multiplied together they will equal 4) and will multiply with the x's to get -8

(3x-2)(x-2)

you can tell that this is the answer because when you multiply though you will get:

3x-2x²-6x+4

or: 3x²-8x_4

Hope this helped


5 0
3 years ago
What is 2 to the power of 2?
Tju [1.3M]
Well 2 to the second power would be 2 * 2 which equals 4
8 0
3 years ago
Other questions:
  • If two dice are rolled, what is the probability that one of them shows a 6 and the sum of the dice is an odd number?
    9·1 answer
  • What are all the prime numbers in 62
    9·1 answer
  • Jose collects baseball cards. Over the last year, the change in the value of his favorite card is $-7. Which best describes the
    7·1 answer
  • Write a rule that represents the function. <br> (1,1/2),(2,1/4),(3.1/8),(4,1/16),(5,1/32)
    5·1 answer
  • Can anyone help me set up a system of equations for these problems??
    8·1 answer
  • Which is a quadratic function?<br><br> A. 3x+y^2=5<br> B. y=3x+5<br> C. x=3y+5<br> D. 3x^2+y=5
    7·1 answer
  • 4<br> Find the surface area of the following rectangular prism?
    14·1 answer
  • The ratio of boys to girls in Mr. Trent's
    11·1 answer
  • the system of equations y =-3x+2 and y =1/2 x -6 is shown on the graph below. What is a reasonable estimate for the solution&gt;
    9·2 answers
  • Please help me :,)<br><br>x=-2<br>x=-1<br>x=0<br>x=1<br>x=2​
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!