MATHEMATICS HIGH SCHOOL

Please help 7th grade math

Answers

Answer 1

Answer:

Answer:

x=20, g=100, f=80

Step-by-step explanation:

when ever somthing is suplementary it means the the answer will euqal to 180 degrees. That means your equation is going to be

3x+40+5x-20=180

8x+20=180

8x=160

x=20

Finding g

3(20)+40

60+40

g=100

FInding f

5(20)-20

100-20

f=80

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Find the length of BC.
A)8
B)12
C)16
D)18

Answers

Answer:

i think its A (edit: im gonna take that back because i was looking at the wrong side, logically it is 12)

Step-by-step explanation:

Answer:

B. 12

Step-by-step explanation:

logically speaking is 12

Max cut of 2 inches of a board he had to cut, but the board was still to long. he did this 4 times. after the 4th cut the board was the right length. write and find the value of an expression to find the change in the length of the board. :)

Answers

x - 8 = y
where x = the original length of the board
and y = the correct length of the board :)

More information is needed to find the original or end lengths of the board.

Can anyone help me? The directions are:Choose the correct conic section to fit each equation. Is it a Circle, Ellipse, Parabola, or Hyperbola?
1) x^2 + y^2 = 16

Answers

$Genereal\ formula\ for\ circle:\n(x-a)^2+(y-b)2=r^2\nCenter\ of\ circle:\ S(a,b)\nr-radius\n\nx^2+y^2=4^2\nIt's\ equation\ of\ circle,\ which\ has\ S(0,0)\ and\ radius\ 4.$

90 is 50% of what number? Answer choices are 45, 120, ,180

Answers

The number whose 50 percent is 90 is 180.

We have,

Equation:

Number x 50% = 90

And,

50% = 50/100 = 0.5

Divide both sides of the equation by 50%

Number = 90 / 0.5

Number = 180

Cross-checked the number.

50% of 180

= 50/100 x 180

= 0.5 x 180

= 90

Therefore,

The number whose 50 percent is 90 is 180.

Learn more about percentages here:

brainly.com/question/11403063

#SPJ6

The answer is 180 bc 50% is half and 90 is half of 180.

If n=-2 should we first add 7 to n or
multiply n by 3? Explain.

Answers

Answer: Add 7 to n to make it a positive number and easier to work with

Step-by-step explanation:

first all 7 then divide by divide by 3

What is the value of cos(x/2) if tan x=1/2 and x is in quadrant III

Answers

The value of cos(x/2) is required.

The required value is $\cos(x/2)=-\sqrt{(5-2√(5))/(10)}$

Trigonometry

The given value is

$\tan x=(1)/(2)$ where x is in quadrant III.

From trigonometricidentities we have

$\sec^2x=1+\tan^2x\n\Rightarrow \sec^2x=1+((1)/(2))^2\n\Rightarrow \sec^2x=(5)/(4)\n\Rightarrow \cos^(2)x=(4)/(5)\n\Rightarrow \cos x=(2)/(√(5))$

If x lies in quadrant III then x/2 lies in quadrant II.

Cos is negative in quadrantIII so,

$\cos x=-(2)/(√(5))=-(2√(5))/(5)$

$\cos (x)/(2)=\pm \sqrt{(1+\cos x)/(2)}\n =\pm\sqrt{(1-(2√(5))/(5))/(2)}\n =\pm\sqrt{(5-2√(5))/(10)}$

Since, x/2 lies in the secondquadrant and cos (x/2) is negative.

The required value is $-\sqrt{(5-2√(5))/(10)}$

Learn more about trigonometry:

brainly.com/question/24349828

Answer:

Step-by-step explanation:

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