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galina1969 [7]
3 years ago
8

Plz help me well mark brainliest if correct....????

Mathematics
2 answers:
sattari [20]3 years ago
8 0

Answer:

i think 18 msy be

Step-by-step explanation:

12345 [234]3 years ago
5 0

Answer:

C

Step-by-step explanation:

18 boys

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9(2a – b)2 – 4(2a – b) – 13
elena-s [515]
18(2a-b)-4(2a-b)-13
=36a-18b-8a+4b-13
Rearrange
=36a-8a-18b+4b-13
=28a-14b-13
3 0
3 years ago
Which equation in rectangular form describes the parametric equations x=5-3cost and y=4+2sint?
Sidana [21]

Answer:

D. (-x+5)^2/9+(y-4)^2/4=1    (I assume there was a mistype)

Step-by-step explanation:

The first step is isolating the sine and cosine functions.

x=5-3cos(t)

x + 3cos(t) = 5

3cos(t) = 5 - x

cos(t) = (5 - x)/3

y=4+2sin(t)

y - 4 = 2sin(t)

(y - 4)/2 = sin(t)

Then, square at both sides of the equal sign

cos²(t) = (5 - x)²/3² = (5 - x)²/9

sin²(t) = (y - 4)²/2² = (y - 4)²/4

Recall the trigonometric identity and replace.

cos²(t) + sin²(t) = 1

(5 - x)²/9 + (y - 4)²/4 = 1

8 0
3 years ago
To graph an inequality on a number line that is
Alborosie

Answer:

open circle

Step-by-step explanation:

the answer is open circle

6 0
3 years ago
Which is the correct way to write 602, 200,000,000,000,000,000,000 in scientific notation?
scoundrel [369]
Scientific notation is
n times 10^x
where 1≤n<10 and x is the number of places the decimal place moved (if it moved to the right, x is negative, if it moved to the left, x is positive)


602, 200,000,000,000,000,000,000.0
we see we need to move decimal to the left 23 spaces to here
6.022 times 10^23

answer is 6.022*10^{23}


6 0
3 years ago
Factor the expression -8x 2+ 22x - 15
Paladinen [302]

The  answer is: 3(2x-5)

6 0
3 years ago
Read 2 more answers
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