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3 years ago

11

Please answer (´∇｀)

1 answer:

garri49 [273]3 years ago

6 0

Answer:
D. 26

Explanation:
10% = 6.5
6.5 x 4 = 26

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-x-y=4 and x+2y=4 use addition to solve the linear system of equations include all your work

Daniel [21]

Answer:

x= -12 and y=8

Step-by-step explanation:

Let's solve your system by substitution.

−x−y=4;x+2y=4

Step: Solve−x−y=4for x:

−x−y=4

−x−y+y=4+y(Add y to both sides)

−x=y+4

−x

−1

=

y+4

−1

(Divide both sides by -1)

x=−y−4

Step: Substitute−y−4forxinx+2y=4:

x+2y=4

−y−4+2y=4

y−4=4(Simplify both sides of the equation)

y−4+4=4+4(Add 4 to both sides)

y=8

Step: Substitute8foryinx=−y−4:

x=−y−4

x=−8−4

x=−12(Simplify both sides of the equation)

Answer:

x=−12 and y=8

8 0

4 years ago

Let f(x)=16x^2-x. Find f(x+1)-f(x)

olasank [31]

f(x+1) = 16(x+1)² - (x+1) = 16(x²+2x+1) - x - 1

= 16x² + 32x + 16 - x - 1 = 16x²+31x+15

so

f(x+1)-f(x) = 16x²+31x+15 - (16x² - x)

= 16x²+31x+15 - 16x² + x

= 32x + 15

8 0

3 years ago

Find the vertex and axis of symmetry for f(x)=2x^2-1

vfiekz [6]

<h3>Axis of symmetry is 0 and vertex is (0, -1)</h3>

<em><u>Solution:</u></em>

<em><u>Given is:</u></em>

$f(x) = 2x^2 - 1$

We have to find the vertex and axis of symmetry

<em><u>The general equation is given as:</u></em>

$f(x) = ax^2 + bx + c$

Comparing with given equation,

a = 2

b = 0

c = -1

<em><u>The axis of symmetry is given as:</u></em>

$x = \frac{-b}{2a}$

$x = \frac{0}{2(2)}\\\\x = 0$

Thus axis of symmetry is 0

The x coordinate of the vertex is the same

x coordinate of the vertex = 0

h = 0

The y coordinate of the vertex is:

k = f(h)

k = f(0)

$f(0) = 2(0) - 1\\\\f(0) = 0 - 1\\\\f(0) = -1$

Thus, y coordinate of the vertex is -1

Therefore, vertex is (0, -1)

3 0

3 years ago

240/30 <br> 144/3<br> 135/45<br> 108/9

Triss [41]

Answer:

240/30= 8

144/3= 48

135/45= 3

108/9= 12

Step-by-step explanation: these are it simplified aka divided

8 0

2 years ago

What value of x is in the solution set of 4x – 12 < 16 + 8x?<br> -10<br> -9<br> -8<br> -7

Akimi4 [234]

Answer:

Step-by-step explanation:

4x - 12 ≤ 16 + 8x

4x - 8x ≤ 16 + 12

- 4x ≤ 28

<em>x ≥ - 7 or [ - 7, ∞ )</em>

3 0

3 years ago