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valina [46]
3 years ago
9

1. 7:4 = 21:x; what is the value of x? A. 12 B. 10 C. 8 D. 6 E. 4 8.

Mathematics
1 answer:
Soloha48 [4]3 years ago
8 0

Answer:

x = 12

I hope it's helps you

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Answer:

y = x + 1 which is marked by the broken line

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2 years ago
How do i find the unknown side length of #9?
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Simply plug-in numbers into the formula. Your answer is 80.
4 0
3 years ago
Solve the equation cos (x/2) = cos x + 1. what are the solutions on the interval 0° ≤ x < 360°?
Sedbober [7]

Answer:

Step-by-step explanation:

cos (x/2)=cos x+1

cos (x/2)=2cos ²(x/2)

2 cos²(x/2)-cos (x/2)=0

cos (x/2)[2 cos (x/2)-1]=0

cos (x/2)=0=cos π/2,cos (3π/2)=cos (2nπ+π/2),cos(2nπ+3π/2)

x/2=2nπ+π/2,2nπ+3π/2

x=4nπ+π,4nπ+3π

n=0,1,2,...

x=π,3π

or x=180°,540°,...

180°∈[0,360]

so x=180°

or

2cos(x/2)-1=0

cos (x/2)=1/2=cos60,cos (360-60)=cos 60,cos 300=cos (360n+60),cos (360n+300)

x/2=360n+60,360n+300

x=720n+120,720n+300

n=0,1,2,...

x=120,300,840,1020,...

only 120° and 300° ∈[0,360°]

Hence x=120°,180°,300°

7 0
2 years ago
Please help, im trying get my grade up to go on a date w my bf
Inga [223]

Answer:

a+4b-24

Step-by-step explanation:

You have to multiply the entire equation by 4, which get you a+4b-24

7 0
3 years ago
Read 2 more answers
IF 24 IS ADDED TO A NUMBER, IT WILL BE 3 TIMES AS LARGE AS IT WAS ORIGINALLY. FIND THE NUMBER
Romashka [77]
x-the\ number\\\\x+24=3x\ \ \ \ \ \ |subtract\ 24\ from\ both\ sides\\\\x=3x-24\ \ \ \ \ \ \ |subtract\ 3x\ from\ both\ sides\\\\-2x=-24\ \ \ \ \ \ \ \ |divide\ both\ sides\ by\ (-2)\\\\\boxed{x=12}\leftarrow answer
3 0
3 years ago
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