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3 years ago

Help please..... What degree is angle BDA? What degree is angle BCA?

Mathematics

1 answer:

Paladinen [302]3 years ago

6 0

<BOA = 360 -250 = 110
<BDA = 110/2 = 55

<BCA = 360 - (90+90+110)
<BCA = 360 - 290
<BCA = 70

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25 points!!!! HELP ANSWER!

Fantom [35]

Answer:

a) 1st and 2nd

b) 4th one

Step-by-step explanation:

8 0

3 years ago

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What two numbers multiply to 10 and add to -29 ?

Degger [83]

Xy=10
x+y=29

subtract x from both sides for second equation

y=-x-29
subsitute in second equaiton
x(-x-29)=10
-x^2-29x=10
add x^2+29x to both sides
x^2+29x+10=0
quadratic formula
if you have
ax^2+bx+c=0,
x= $\frac{-b+/- \sqrt{b^{2}-4ac} }{2a}$

so
x^2+29x+10=0
a=1
b=29
c=10
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x= $\frac{-29+/- \sqrt{841-40} }{2}$
x= $\frac{-29+/- \sqrt{801} }{2}$
x= $\frac{-29+/- 3\sqrt{89} }{2}$

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those are the 2 numbers
aprox=-28.65 and -0.349

5 0

3 years ago

Read 2 more answers

Meg is starting a day-care center for the people in her community. She decided to charge $25 per day per child, out of which $5

attashe74 [19]

If I figured correctly it is 5 kids. Sorry if wrong!

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3 years ago

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A rectangular banner has a length that is two feet shorter than twice its height, ℎ. If the expression ℎ(2ℎ−2) represents the ar

densk [106]

Answer:

h = 6

Step-by-step explanation:

Given he area of the banner expressed as;

A = ℎ(2ℎ−2)

h is the height of the banner

A is the area = 60

Substitute

60 = ℎ(2ℎ−2)

60 = 2h² - 2h

30 = h² - h

h²-h-30 = 0

Factorize;

h²-6h+5h-30 = 0

h(h-6)+5(h-6) = 0

(h-6)(h+5) = 0

h - 6 = 0 and h+5 = 0

h = 6 and -5

Since the height cannot be negative;

h = 6

Hence he height of the banner is 6

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3 years ago

1/2x+1/3y=5 and 1/4x+y=10 solve this system by substitution

qaws [65]

Answer:

(x, y) = (4, 9)

Step-by-step explanation:

You can use the second equation to write an expression for y.

y = 10 - 1/4x . . . . subtract 1/4x from the given 2nd equation

Now, substitute that for y in the first equation:

1/2x + 1/3(10 -1/4x) = 5

1/2x + 10/3 -1/12x = 5 . . . . eliminate parentheses

You can work this a couple of ways from here. One is to multiply by 12 to eliminate fractions. Another is to work with the numbers as they are. We'll do that, because we don't get enough practice doing arithmetic with fractions.

5/12x = 5/3 . . . . . subtract 10/3

x = (5/3)/(5/12) = 12/3 = 4

From above, we can use our expression for y:

y = 10 - 1/4·4 = 9

The solution is (x, y) = (4, 9).

5 0

3 years ago