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Igoryamba
3 years ago
9

21 is 70% of __________.

Mathematics
1 answer:
Yuki888 [10]3 years ago
6 0
Simple, first, change 70% into 0.7

thus,

21= 0.7*n

21/0.7=0.7n/0.7

30=n

Thus, your answer, is 30.
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Use the order of operations to evaluate -(3 2) 2 + 4 * 3 - 2
LenaWriter [7]

So first remember the order of operations. Parentheses, exponents, multiply, divide, addition, subtraction.

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-(3*2)2+4*3-2

Multiply the three and two inside the parentheses first.

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Next multiply any numbers that need multiplied.

-12+12-2

Next add and subtract from left to right to get an answer of...

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Hope this helps!

4 0
4 years ago
4n + 5n= -9? What is the answer?
timurjin [86]

add 4n and 5n, which is 9. 9n=-9, and if u divide both sides by nine, n=-1

6 0
3 years ago
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patriot [66]

Answer:

f(x) = ( 1/3) ^ (x)

Step-by-step explanation:

The function is

f(x) = (1/3) ^ (x)

When x = 1  f(x) = 1/3

when x=2    f(x) = 1/9

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7 0
3 years ago
Foci of ellipse of 3x2 + y2 =9
Oksi-84 [34.3K]

Answer:

x=√-1/3 y^2 +3 or x=-√-1/3 y^2 +3

Step-by-step explanation:

Let's solve for x.

3x2+y2=9

Step 1: Add -y^2 to both sides.

3x2+y2+−y2=9+−y2

3x2=−y2+9

Step 2: Divide both sides by 3.

3x^2/3= -y^2+9/3

x^2=-1/3 y^2 +3

x=√-1/3 y^2 +3 or x=-√-1/3 y^2 +3

Hope it helped!

8 0
3 years ago
A) x+(3x÷2y)<br>b) (b⁹)²×b⁵÷b¹¹=<br>c) (4²)⁶×4⁷÷4¹⁶=​
monitta

Answer:

a) x+3x/2y or (3x+2xy)/2y

b) b^12

c) 4^3 or 64

Step-by-step explanation:

4 0
3 years ago
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