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3 years ago

30% of___ is 15 ?????

Mathematics

1 answer:

tensa zangetsu [6.8K]3 years ago

7 0

Answer:

15 is 30% of 50

Step-by-step explanation:

We have, 30% × x = 15

Multiplying both sides by 100 and dividing both sides by 30,

we have x = 15 × 100/30

x = 50

If you are using a calculator, simply enter 15×100÷30, which will give you the answer.

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55 points see attachment below

Ludmilka [50]

Answer:

f(3) = -20

Step-by-step explanation:

To find the value of a function, substitute the number for the variable and do the arithmetic.

f(x) = -2x^2 +x -5 . . . . . . given

f(3) = -2(3^2) +(3) -5 . . . . function value for x = 3

f(3) = -2(9) +3 -5 = -18 +3 -5

f(3) = -20

4 0

2 years ago

PLS I need help with this,

Over [174]

Answer:

Step-by-step explanation:

2:16-2:18=3

180ft-185ft=5

6 0

3 years ago

Whoever gives me the correct answer to this will get a brainlest <br> I need the answer ASAP!

Amiraneli [1.4K]

Volume of cone= 1/3πr^2h

8842.24 m^3= 1/3πr^2h

1/3*3.14*33*r^2= 8842.24m^3

r^2 = 8842.24*3/3.14*33

r^2= 26526.72/103.62

r^2 = 256

r= √256

r= 16m

Hope it helps. Please mark brainliest.

8 0

3 years ago

36b + 13 + 12b = − 11,

AlexFokin [52]

Answer:

-0.5

Step-by-step explanation:

36b+12b=-11-13

48b=-24

B=-24/48=-1/2

B=-0.5

Please mark as brainliest

3 0

3 years ago

After being rearranged and simplified, which of the following equations could

masha68 [24]

Answer:

C and D

Step-by-step explanation:

The quadratic formula is

x= (-b±√b²-4ac)/2a

The formula uses the numerical coefficients in the quadratic equation.

The general quadratic equation is ax²+bx+c where a, b and c are the numerical coefficients

So, lets try and see;

$5x+4=3x^4-2\\\\=3x^4-5x-2-4\\=3x^4-5x-6\\a=3,b=-5,c=-6$

But due to the fact that in this equation you have x⁴, the equation is not a quadratic equation thus can not be solved using this formula

$-x^2+4x+7=-x^2-9\\\\\\=-x^2+x^2+4x+7+9\\=4x+16$

$9x+3x^2=14+x-1\\\\\\=3x^2+9x-x-14+1\\\\=3x^2+8x-13\\\\\\a=3,b=8,c=-13\\$

$2x^2+x^2+x=30\\\\\\=3x^2+x-30\\\\\\a=3,b=1,c=-30$

From the checking above, the equations will be C and D

7 0

3 years ago

Read 2 more answers