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3 years ago

What is 8a = 5a + 21 please and thank you

Mathematics

2 answers:

Sergeeva-Olga [200]3 years ago

3 0

8a-5a=21
3a=21
a=21/3
a=7

djyliett [7]3 years ago

3 0

Here's the answer to your question

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For what value of x is sq 896z^15/225z^6 = xz^4/15

Ratling [72]

Answer:

Value of x is, 8

Step-by-step explanation:

Given: $\sqrt{\frac{896z^{15}}{225z^6}} =\frac{xz^4}{15} \sqrt{14z}$ ,.....[1]

To find the value of x:

Using exponent rules:

$(a^n)^m = a^{nm}$

$a^n \cdot a^m = a^{n+m}$

Taking square both sides in [1] we have;

$\frac{896z^{15}}{225z^6} = (\frac{xz^4}{15})^2 \cdot (14z)$

Simplify:

$\frac{896z^{15}}{225z^6} =\frac{x^2z^8}{225} \cdot (14z)$

$\frac{896z^{15}}{225z^6} =\frac{14x^2z^9}{225}$

Multiply both sides by $\frac{225}{14z^9}$ we get;

$x^2 = \frac{896 z^{15}}{225z^6} \times \frac{225}{14 z^9} = \frac{896 z^{15}}{14 z^{9+6}}$

Simplify:

$x^2 = \frac{896 z^{15}}{14 z^{15}} = 64$

$x = \sqrt{64}$

Simplify:

x = 8

Therefore, the value of x is, 8

5 0

3 years ago

Need help on these three. thanks:))

Anton [14]

1. 0.3% or 30%
2. 15 minutes
3. 48 times

4 0

3 years ago

Which one should I choose?

bonufazy [111]

Answer:

Step-by-step explanation:

The answer is A as the height starts at 36 and decreases by 9 inches vertically every 12 inches it goes down horizontally.

If you turn this into an equation, you get y = -(9/12)x+36.

Then, you simplify this to y = -(3/4)x+36, which is A.

8 0

3 years ago

Hey y'all I have a question, who ia correct..? (If possibly could you also tell me how to find out if a trianhle is unique?) Tha

Flura [38]

Answer:

Hazal

Step-by-step explanation:

If you use the forama crooetly then you get 2 trinngles

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3 years ago

Please help, i cannot get this wrong

OleMash [197]

7x^2 c is the answer

8 0

3 years ago

Read 2 more answers