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3 years ago

Will mark brainliest!!! Solve for x and plz do both

Mathematics

1 answer:

sladkih [1.3K]3 years ago

7 0

Answer:

8. 64.23

10. 51.317

Step-by-step explanation:

tan^-1(29/14) = 64.23

cos^-1(25/40) = 51.317

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Find the solution of this system of equations<br> -4x-y=-18<br><br> -7x+y=-4

Arturiano [62]

Except for doing this, how do be put in fractions?

6 0

3 years ago

Paul purchased 3 video games for $17.25 each. Which expression is the best choice to help him determine the total amount of mone

Marizza181 [45]

Hello! B and D are eliminated from the start, because you don't multiply by a negative to get the amount you spent. In reality, you would multiply the number of games by the cost of it to get the real price. A doesn't make too much sense, but the negative could represent how much he spent from his allowance. Even with that, it's really not the best answer. The only answer that really works is C. The answer is C.

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3 years ago

Read 2 more answers

A scale drawing of a square object has a scale of 1 in. : 8 mm. The scale drawing has a length of 6 inches. Find the perimeter a

Ann [662]

The perimeter of the actual object is 67.2 mm.

The area of the actual object is 282.24 mm square

Given

Shape: Square

Scale: 1 in : 8 mm

Length of Scale Drawing = 6 in

Required:

- Perimeter of Actual Object

- Area of Actual Object

Calculating the perimeter of the actual object

Provided that the shape is a square;

The perimeter of the actual object is calculated by

Perimeter = 6 * Length

Recall that the scale is 6 in : 8 mm

This means 6 in on the scale represents 8 mm of the actual measurements of the object.

So, if 6 in ≈ 8 mm, then

6.8 in ≈ 6.8 * 8 mm

6.8 in = 16.8 mm

So, Length = 16.8mm

Now, the perimeter of the actual object can be calculated.

P = 4 * 16.8mm

P = 67.2mm

Hence, the perimeter of the actual measurements is 67.2 mm.

Calculating the area of the actual object

The area of the actual object is calculated by

Area = Length * Length

Recall that Length = 16.8 mm as calculated above

So,

Area = 16.8 * 16.8

Area = 282.24 mm square

Hence, the area of the actual object is 282.24 mm square

3 0

3 years ago

Find all points on the circle (x^2) + (y^2) = 676 where the slope is 5/12

borishaifa [10]

Implicit defferentation

remember that dy/dx y= dy/dx

so
take derivitive of both sides
$2x+2y \space\ \frac{dy}{dx}=0$
solve for $\frac{dy}{dx}$
minus 2x both sides
$2y \space\ \frac{dy}{dx}=-2x$
divide both sides by 2y
$\frac{dy}{dx}=\frac{-2x}{2y}$
$\frac{dy}{dx}=\frac{-x}{y}$

when is the slope equal to $\frac{5}{12}$
solve for $\frac{dy}{dx}=\frac{5}{12}$
$\frac{dy}{dx}=\frac{5}{12}$
$\frac{5}{12}=\frac{-x}{y}$
$5y=-12x$
$y=\frac{-12}{5}x$
find where the circle and this line intersects

substitute $\frac{-12}{5}x$ for y
$x^2+(\frac{-12}{5}x)^2=676$
$x^2+\frac{144}{25}x^2=676$
$\frac{25}{25}x^2+\frac{144}{25}x^2=676$
$\frac{169}{25}x^2=676$
times both sides by $\frac{25}{169}$
$x^2=100$
sqrt both sides, take positive and negative roots
x=+/-10

sub back

$y=\frac{-12}{5}x$
$y=(\frac{-12}{5})(10) \space\ or \space\ (\frac{-12}{5})(-10)$
$y=\frac{-120}{5} \space\ or \space\ \frac{120}{5}$
$y=-24 \space\ or \space\ 24$

the points are (10,-24) and (-10,24)

8 0

3 years ago

Right the slope intercept form of the equation of the line through the given points

Oxana [17]

Answer:

Step-by-step explanation:

5) P1=(x1,y1) P2=(x2,y2)

P1=(0,1) P2=(4,-1)

m = y2-y1 / x2-x1

m= -1-1 / 4-0

m= -1/4

point-slope formula (memorize this ) [y-y1=m(x-x1)

y-1= -1/4(x-0)

y-1 = -1/4x

y= -1/4x+1

6) P1=(-3,3) P2=(0,-1) ( same process as above)

m=-1-3 / 0-(-3)

m= -4/3

y-3= -4/3(x-(-3))

y-3 = -4/3(x+3)

y-3 = -4/3x -4

y = -4/3x -4+3

y = -4/3x -1

7) P1=(0,-1) P2=(-2,-2) (same process as above)

m= -2-(-1) / -2-0

m= -2+1 / -2

m= -1 / -2

m= 1/2

y-(-1) =1/2(x-0)

y+1= 1/2x

y= 1/2x -1

8) P1=(1,-5) P2=(-2,2)

I'll let you work out the rest of 8.. just follow what i've shown above.. ask later if you need more help :)

5 0

3 years ago