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Alina [70]
3 years ago
7

Solve for A. Please help and thank u

Mathematics
1 answer:
kobusy [5.1K]3 years ago
8 0

Answer:

a = -2

Step-by-step explanation:

-3a + 8 = 14

14 - 8

= 6

-3a = 6

6/-3

= -2

a = -2

Please give me brainliest :)

You might be interested in
Which equation shows the commutative property of addition?
oksian1 [2.3K]

Answer:

The equation shows the commutative property of addition is  4 +3 = 3 + 4 .

Option (A) is correct.

Step-by-step explanation:

Commutative property of addition

The commutative property for addition states that

a + b = b + a .

Where a, b are any number.

thus

this above condition is satisfied by equation

4 + 3 = 3 + 4

7 = 7

Therefore Option (A) is correct.


5 0
3 years ago
Read 2 more answers
(1 point) A student was asked to find the equation of the tangent plane to the surface z=x2−y3 at the point (x,y)=(5,1). The stu
Nonamiya [84]

Answer:

Options a and d are the correct ones.

Step-by-step explanation:

The complete question is as follows

A student was asked to find the equation of the tangent plane to the surface z = x^2-y^3 at the point (x,y)=(5,1). The student's answer was  z = 24+2x(x-5)-3y^2(y-1). (a) At a glance, how do you know this is wrong. What mistakes did the student make? Select all that apply.

a) The answer is not a linear function

b) The (x-5) and (y-1) should be x and y

c) the 24 should not be in the answer

d) the partial derivatives were not evaluated at the point

e) all of the above.

Recall that, given a surface of the form z=f(x,y) where f is differentiable, then at a given point (x_0,y_0) we can find the equation of the tangent plane by

z=f(x_0,y_0)+\frac{df}{dx}(x_0,y_0) (x-x_0)+\frac{df}{dy}(x_0,y_0) (y-y_0)

We are given that (x_0,y_0) = (5,1) Note that f(5,1) = 24. Then, c is not true. Also, the formula says that we must have the factors (x-5) and (y-1), since we are evaluating the tangent plane in a neighborhood of that point, hence option b is not true. Since B and C are not true, then E is not true. Note that the given function by the student has a mutiplication of 2x and (x-5) which will give us the function 2x^2-10 which is of degree two. Then, the function given by the student is not a linear function, since linear functions have a degree at most 1. Finally, we must check that d is also true.

REcall that

\frac{df}{dx} = 2x, \frac{df}{dy} = -3y^2

so we see that this coincide with the the terms that multiply the factors (x-5) and (y-1) respectively, which tell us that even though the student was trying to follow the formula, he/she forgot to evaluate the partial derivatives at the given point, hence the option D is also true.

Recall that if we want the tangent plane at the point given, we must evaluate the partial derivatives at x=5 and y=1. Hence, the formula of the tangent plane is

z = 24+10(x-5)-3(y-1)

5 0
3 years ago
F(-7) if f(x) = 8x 15
scoray [572]
All you do is plug in -7 so you get f(x)=8(-7)*15 you get -56*15 which goes to -840
3 0
3 years ago
The points (-1,2) and (4,y) have a slope of -4/5. what is the y-coordinate of the point (4,y)
Nastasia [14]

Answer:

y = - 2

Step-by-step explanation:

Calculate the slope m using the slope formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (- 1,2) and (x₂, y₂ ) = (4, y)

m = \frac{y-2}{4+1}, hence

\frac{y-2}{5} = - \frac{4}{5} ( cross- multiply )

5(y - 2) = - 20 ( divide both sides by 5 )

y - 2 = - 4 ( add 2 to both sides )

y = - 2

coordinates of point are (4, - 2)

7 0
3 years ago
4(x - 1) =2(x + 2)<br> 10. 8
Angelina_Jolie [31]

Answer:

9.4

Step-by-step explanation:

8 0
2 years ago
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