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2 years ago

13

A square has a vertex at (-15, -9) and is dilated at the origin with a scale factor of 1/3. What is the new coordinate of the ve

rtex?
(-3, 5)
(-5, -3)
(27, 45)
(-45, -27)

1 answer:

vladimir1956 [14]2 years ago

7 0

Answer:

(-3, 5) sorry if I'm not correct

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a Salesman earn 6% Commission on all the merchandise he that he sells last month he sold $3,000 worth of merchandise how much co

irina1246 [14]

$540

6% = .06

“of” = multiply

so 6% of 9000 can be written as .06 x 9000 , which is 540

Brainliests me

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2 years ago

3x^2+kx=-3 What is the value of K will result in exactly one solution to the equation?

Scorpion4ik [409]

Answer:

For k = 6 or k = -6, the equation will have exactly one solution.

Step-by-step explanation:

Given a second order polynomial expressed by the following equation:

$ax^{2} + bx + c, a\neq0$ .

This polynomial has roots $x_{1}, x_{2}$ such that $ax^{2} + bx + c = (x - x_{1})*(x - x_{2})$ , given by the following formulas:

$x_{1} = \frac{-b + \sqrt{\bigtriangleup}}{2*a}$

$x_{2} = \frac{-b - \sqrt{\bigtriangleup}}{2*a}$

$\bigtriangleup = b^{2} - 4ac$

If $\bigtriangleup = 0$ , the equation has only one solution.

In this problem, we have that:

$3x^{2} + kx + 3 = 0$

So

$a = 3, b = k, c = 3$

$\bigtriangleup = b^{2} - 4ac$

$\bigtriangleup = k^{2} - 4*3*3$

$\bigtriangleup = k^{2} - 36$

We will only have one solution if $\bigtriangleup = 0$ . So

$\bigtriangleup = 0$

$k^{2} - 36 = 0$

$k^{2} = 36$

$k = \pm \sqrt{36}$

$k = \pm 6$

For k = 6 or k = -6, the equation will have exactly one solution.

3 0

3 years ago

Question 7 of 10

solniwko [45]

Answer:

what may be true

Step-by-step explanation:

i just took the test and got the answer correct, i hope this helps.

5 0

3 years ago

Answer all three please

sweet-ann [11.9K]

6. Answer:

72.84

Step-by-step explanation:

To find the perimeter of the rectangle, just add the sides together except the one connected to the semicircle

12 + 15 + 15 = 42

The diameter of the semi circle is 12

πr + d = 6 * π + 12 ≈ 30.84

Add them together

42 + 30.85 = 72.84

7. Answer:

78.54

(78.5)

Step-by-step explanation:

The shape is a circle

Radius is 5

Diameter is 10 (diameter is always double of the radius)

π * r^2 = π * 25 cm^2 = 78.54 cm^2

8. Answer:

50.27

Step-by-step explanation:

The shape is a circle

Radius is 4

Diameter is 8 (diameter is always double of the radius)

π * r^2 = π * 16 ft^2 = 50.27 ft^2

(16 = 8 * 2)

7 0

3 years ago

If cosa=1/2(a+1/a), verify that. cos2a=1/2(a²+1/a²)

Alborosie

Answer:

see explanation

Step-by-step explanation:

using the identity

cos2a = 2cos²a - 1 , then

cos2a

= 2[ $\frac{1}{2}$ (a + $\frac{1}{a}$ ) ]² - 1

= 2 [ $\frac{1}{4}$ (a² + $\frac{1}{a^2}$ + 2) ] - 1

= $\frac{1}{2}$ (a² + $\frac{1}{a^2}$ ) + 1 - 1

= $\frac{1}{2}$ (a² + $\frac{1}{a^2}$ ) ← thus verified

3 0

2 years ago