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2 years ago

3

Mathematics

1 answer:

solniwko [45]2 years ago

6 0

Answer:

so I'm doing the same test so the first answer the first answer is 20 and the second I'm not sure but I believe its also 20 sorry if I'm wrong.

Step-by-step explanation:

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5). Jonathan bought a new jacket. The jacket originally cost $79.95 but is on sale for 20% off. How much

Harlamova29_29 [7]

Answer:c
Explanation: well 79.95-20%=63.96

5 0

1 year ago

What is the totale of the recta square meter

yan [13]

Answer:

Step-by-step explanation:

7 0

1 year ago

Find+the+positive+value+for+α+if+the+radius+of+the+circle+3x^2+3y-6αx+12y-3α=0+is+4

Alik [6]

Answer:

$\alpha=3$

Step-by-step explanation:

Equation of a Circle

A circle of radius r and centered on the point (h,k) can be expressed by the equation

$(x-h)^2+(y-k)^2=r^2$

We are given the equation of a circle as

$3x^2+3y^2-6\alpha x+12y-3\alpha=0$

Note we have corrected it by adding the square to the y. Simplify by 3

$x^2+y^2-2\alpha x+4y-\alpha=0$

Complete squares and rearrange:

$x^2-2\alpha x+y^2+4y=\alpha$

$x^2-2\alpha x+\alpha^2+y^2+4y+4=\alpha+\alpha^2+4$

$(x-\alpha)^2+(y+2)^2=r^2$

We can see that, if r=4, then

$\alpha+\alpha^2+4=16$

Or, equivalently

$\alpha^2+\alpha-12=0$

There are two solutions for $\alpha$ :

$\alpha=-4,\ \alpha=3$

Keeping the positive solution, as required:

$\boxed{\alpha=3}$

8 0

2 years ago

Dog food costs 9$ per bag and cat food costs 8$ per bag. if billy spent 89$ and purchased 6 bags of dog food, how many bags of c

REY [17]

6 bags of dog food × $9 = 54
$89 total - $54 spent on dog food = $35 spent on cat food

$35 / $8 = 4.375, but you can't have decimals for cat food bags so round down.

= 4 bags of cat food

3 0

2 years ago

Need someone to help me please!

mylen [45]

Answer:

$\huge\boxed{\sf A = 8\ cm\²}$

Step-by-step explanation:

Given data:

Base = b = 4 cm

Height = h = 4 cm

Required:

Area of triangle = A = ?

Formula:

A = bh / 2

Solution:

A = (4)(4) / 2

A = 16 / 2

A = 8 cm²

$\rule[225]{225}{2}$

Hope this helped!

4 0

2 years ago

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