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3 years ago

I'm thinking of a number. I subtract 4 and then halve the result. The answer is 9. What is the number I am thinking of?

Mathematics

2 answers:

yawa3891 [41]3 years ago

8 0

Answer : 22
This is because we use inverse.
double 9= 18
18+4=22

Maru [420]3 years ago

4 0

Hey There

Correct answer: 13

Why? To find this out you need to add 4 to 9 to figure it out

have a good day

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E^3x.cos4x.sin2x hii please solv this you have to differentiate

finlep [7]

Answer:

$y = e^{3x}.cos4x.sin2x$

$=> y' =- 3e^{3x}.4sin4x.2cos2x=-24.e^{3x}.sin4x.cos2x$

$dy=y'.dx => dy = -24e^{3x}.sin4x.cos2x.dx$

Step-by-step explanation:

6 0

2 years ago

I give you 35 points, PLS HELP!!<br><br> If CD = 8√3, find AE

Dimas [21]

Answer:

not 35

Step-by-step explanation:

it 18

3 0

3 years ago

Simplify the expression(a4−6a2b2+ b4)−(−2a4+5a2b2+ 3b4) and hence, find its value for a = 2and b = −1.

ELEN [110]

Answer:

(a) $3a^4 - 11a^2b^2 -2b^4$

(b) $3a^4 - 11a^2b^2 -2b^4= 2$

Step-by-step explanation:

Given

$(a^4 - 6a^2b^2+ b^4) - (-2a^4+5a^2b^2+ 3b^4)$

Solving (a): Simplify

$(a^4 - 6a^2b^2+ b^4) - (-2a^4+5a^2b^2+ 3b^4)$

Open brackets

$a^4 - 6a^2b^2+ b^4 +2a^4-5a^2b^2- 3b^4$

Collect Like Terms

$a^4 +2a^4- 6a^2b^2-5a^2b^2+ b^4 - 3b^4$

Simplify Like Terms

$3a^4 - 11a^2b^2 -2b^4$

Solving (b): Simplify when a = 2 and b = -1

$3a^4 - 11a^2b^2 -2b^4$

$3*(2)^4 - 11*(2^2)*(-1)^2 -2*(-1)^4$

$3 * 16 - 11 * 4 * 1 - 2 * 1$

$48 - 44 - 2$

$= 2$

Hence:

$3a^4 - 11a^2b^2 -2b^4= 2$

4 0

2 years ago

The area of a rectangle is 2x2 - 11x + 15 square feet. the length of the rectangle is 2x - 5 feet. what is the width of the rect

ioda

The area is = the length*the width
2x^2-11x+15= (2x-5)* the width
you have to divide 2x^2 - 11 x + 15 at 2x-5
2x^2-11x+15 | 2x-5
-2x*2+5x x-3
-------------
/ -6x+15
+6x-15
-----------------
/ /
the answer is X-3

3 0

3 years ago

There are 100 or 102 pennies in a dollar. How many pennies are there in a million (106) dollars? Write your answer using exponen

ikadub [295]

Answer:

10^8 pennies in a million dollars.

Step-by-step explanation:

I will work with the accepted number of pennies in a dollar: 100.

Then the number of pennies in a million dollars is

p = 100*10^6, or 1*10^8, or just 10^8.

7 0

3 years ago