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Korolek [52]
2 years ago
11

7 cups of coffee and 4 pieces of toast cost $20 . 5 cups of coffee and 3 pieces of toast cost $14.50 . find the cost of each ite

m.​
Mathematics
1 answer:
Angelina_Jolie [31]2 years ago
5 0

Answer:

Step-by-step explanation:

Bánh mì 1.5 đô

Cà phê 2 đô

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A^2-b^2+4b-4 please solve it step by step i will mark you brainlest
alex41 [277]

Answer:

b = a + 2 or b = 2 - a

Step-by-step explanation:

Solve for b:

-4 + a^2 + 4 b - b^2 = 0

The left hand side factors into a product with two terms:

(2 + a - b) (-2 + a + b) = 0

Split into two equations:

2 + a - b = 0 or -2 + a + b = 0

Subtract a + 2 from both sides:

-b = -a - 2 or -2 + a + b = 0

Multiply both sides by -1:

b = a + 2 or -2 + a + b = 0

Subtract a - 2 from both sides:

Answer:

b = a + 2 or b = 2 - a

3 0
3 years ago
Which statement BEST explains the relationship among these three facts?
11Alexandr11 [23.1K]

Answer:

The chocolate drink became popular in Europe, because sugar made it taste better.

Hope this helps! :)

7 0
3 years ago
Read 2 more answers
Use the net to find the surface area of the prism
arsen [322]

Answer

364 i think

Step-by-step explanation:

find the area of triangles + area of rectangles

area of triangles: b x h x 1/2

6 x 4 x 1/2

= 12

but two triangles, so . double it and then you get 24 for the two triangles areA

area of rectangles;

l x w

22 x 6

= 132

but two up and down rectangles, so double it = 264

now back rectangle:

l x w

22 x 4

= 88

Add it all up together and you have the surface area!

Surface Area - The area of the surface of the 3D object, NOT volume

pls mark brainliest unless someone else answered it or im wrong thank you! :D

7 0
2 years ago
How do I state the number of complex roots, the possible number of real and imaginary roots, and the possible rational roots for
Cerrena [4.2K]

Answer:

sqt(b^2-4ac)

Step-by-step explanation:

The expression which is given in the answer is called the discriminant. Because it discriminate all the types of roots which can be derived from any quadratic equation. Now imagine a standard quadratic equation:

ax^2+bx+c

The value of x can be derived from quadratic formula which is

x = -b±[(b^2-4ac)^(-1/2)]/2a

Now take out discriminant, which is

sqrt(b^2-4ac)

if you put values of a,b and c from a quadratic equation,

you can possibly have three types of discriminant values. Lets represent discriminant as D

So, D can be 0

D can be any real number greater than 0

D can be any real number less than 0

Now we will understand each.

If D = 0, you can see that the both roots will be equal, because in standard quadratic formula, discriminant will make no change either added or subtracted. So we will have equal roots if discriminant is zero. Equal roots means we will only have one value of roots.

If D is any real number greater than zero, it will be simply any real roots. There will be two values of roots, because you will first add up discriminant in quadratic formula and then subtract, because this sign ± means you have two perform both functions one by one.

If D is real number less than 0, we know that by applying square root, it will be converted into an imaginary number, a number with iota, e.g 4i. You will have two imaginary roots here due to this sign ± means you have two perform both addition and subtraction one by one.

Now the complex numbers are basically combination of real and imaginary numbers, so if discriminant has value less than zero, you would have imaginary as well as complex roots and there number will be two because due to this sign ± you have to perform addition and subtraction again.

7 0
3 years ago
Mr.Thomas received $666.50 for two plumbing jobs. He gave 12% of the total to a prison ministry to purchase Bible study helps fo
erica [24]
666.50 x 12% = 79.98
8 0
3 years ago
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