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2 years ago

20.57 is 42.5% of ______.

1 answer:

7 0

Percent is parts out o 100
42.5%=42.5/100=0.425

'of' means multiply

20.57 is 42.5% of ? means
20.57=0.425 times ?
divide both sides by 0.245
48.4=?

20.57 is 42.5% of <u>48.4</u>

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2 sin^2 (x) -5 sin (x) -3=0

andreyandreev [35.5K]

we have that

$2sin^{2} x-5sin x-3=0$

I. Rewrite the equation by substituting the expression u in for sin x.

$2u^{2} -5u-3=0$

II. Factor the quadratic expression. Rewrite the equation with factors instead of the original polynomial.

$2u^{2} -5u-3=0$ is equal to

using a graph calculator-----> see the attached figure

$(u-3)*(2u+1)=0$

III. Use the zero product property to solve the quadratic equation.

$(u-3)*(2u+1)=0$

(u-3)=0--------------> u=3

(2u+1)=0-------- 2u=-1------> u=-1/2-----> u=-0.5

IV. Rewrite your solutions to Part III by replacing u with sin x.

sin x=3--------> is not the solution (sin x can not be greater than 1)

sin x=-0.50------>is the solution

V. Solve the remaining equations for x, giving all solutions to the equation.

sin x=-0.50

if the sine is negative

then

x belong to the III or IV quadrant

we know that

sin 30°=0.50

the solution for the III quadrant is

x=180°+30°-------> x=210°

the solution for the IV quadrant is

x=360°-30°------> x=330°

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2 years ago

Given that y = 9x+4 -3(7 + x ) when x=3.2

djyliett [7]

9(3.2)+4-3(7+3.2)=2.2

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3 years ago

The product of 7 and 6

stira [4]

Step-by-step explanation:

7 × 6 = 42 Answer

hope it helps

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2 years ago

Read 2 more answers

Help please asap :))

erma4kov [3.2K]

Go on kahoot if your still doing it go to practice and see what the answers are and either memorize them or write them down or do the math problem

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3 years ago

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The point A(-7, 3) is translated onto A' by the vector =(5, -4).

Lubov Fominskaja [6]

Answer:

o(-2,-1)

Step-by-step explanation:

Let point A be initial point and A' be terminal point.

A(-7,3), A'(x,y) and V=(5,-4)

V=(Xf-Xi,Yf-Yi)

(5,-4)=(x-(-7),y-3)

(5,-4)=(x+7,y-3)

5=x+7. -4=y-3

5-7=x. -4+3=y

x=-2. y=-1

A'=(-2,-1)

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2 years ago