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4 years ago

Factorise Fully: 21b-3b^2

Mathematics

1 answer:

Alexus [3.1K]4 years ago

4 0

See attachment for math work and answer.

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Please help me with this

Lubov Fominskaja [6]

Answer:

Step-by-step explanation:

with 5th, you are going to muliply the fraction by 20 to get the answer as a decimal/percent.

0.75=3/4

4/9=0.44 re

6.5=650%

5 0

3 years ago

5 ÷ 6 is 5/6. What 1/6 of 5?

Romashka-Z-Leto [24]

Answer: 0.8333

Step-by-step explanation:

3 0

3 years ago

Prove that if a and b are integers, then a^2-4b egal or non-egal 2

Lera25 [3.4K]

Answer:

tex]a^2 - 4b \neq 2[/tex]

Step-by-step explanation:

We are given that a and b are integers, then we need to show that $a^2 - 4b \neq 2$

Let $a^2 - 4b = 2$

If a is an even integer, then it can be written as $a = 2c$ , then,

$a^2 - 4b = 2\\(2c)^2 - 4b =2\\4(c^2 -b) = 2\\(c^2 -b) =\frac{1}{2}$

RHS is a fraction but LHS can never be a fraction, thus it is impossible.

If a is an odd integer, then it can be written as $a = 2c+1$ , then,

$a^2 - 4b = 2\\(2c+1)^2 - 4b =2\\4(c^2+c-b) = 2\\(c^2+c-b) =\frac{1}{4}$

RHS is a fraction but LHS can never be a fraction, thus it is impossible.

Thus, our assumption was wrong and $a^2 - 4b \neq 2$ .

7 0

3 years ago

Answer this for 15 points

djyliett [7]

Answer:

Step-by-step explanation:

y = mx + b

y = -2/3 x + b

(x, y) = (3, 0)

0 = -2/3 (3) + b

0 = -2 + b

b = 2

y = -2/3 x + 2

Answer: A.

8 0

3 years ago

Read 2 more answers

What is the volume of a rectangular prism

GuDViN [60]

Answer:

A; 120 cubic inches

Step-by-step explanation:

Let us start with the formula of the volume of a rectangular prism, $V=l*w*h$ , where l represents the length of the prism, w represents the width of the prism, and h represents the height of the prism. It is given to us that h =5 inches, w =3 inches, and l =8 inches. Let's plug the values in:

$V= 8*3*5\\V=120$

A. The volume of the rectangular prism is 120 cubic inches.

I hope this helps! Let me know if you have any questions :)

5 0

3 years ago