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Svetradugi [14.3K]
3 years ago
7

bob pays $20 to have the internet installed and $15 a month for service. how much will bob pay for 1 year of internet use? a.$18

0 b.$200 c.$240 d.$420
Mathematics
2 answers:
Genrish500 [490]3 years ago
7 0
I think it's B.)200 dollars hopefully it helps or at least is right
Lilit [14]3 years ago
6 0
The answer is b. On year is 12 months. 15 multiplied by 12 is 180, and adding on the 20 dollars he paid initially, your answer is 200.
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What is a word problem that equals 12!! please hurry
tekilochka [14]

You have 24 apples and you get rid of 12. How many do you have left?

24-12=x

7 0
3 years ago
Which of the following functions are solutions of the differential equation y'' + y = 3 sin x? (select all that apply)
DiKsa [7]

Answer:

C

Step-by-step explanation:

We must compute the derivatives and check if the equation is satisfied.

A. y'=(3\sin x)'=3\cos x. Differentiate again to get y''=(3\cos x)'=-3\sin x, then y''+y=-3\sin x+3\sin x=0\neq 3\sin x so this choice of y doesn't solve the equation.

B. y'=3\sin x+3x\cos x-5\cosx +5x\sin x=(5x+3)\sin x+(3x-5)\cos x and y''=5\sin x+(5x+3)\cos x+3\cos x-(3x-5)\sin x=(10-3x)\sin x+(5x+6)\cos x, then y''+y=10\sin x+6\cos x\neq 3\sin x so y is not a solution

C. y'=\frac{-3}{2}\cos x+\frac{3}{2}x\sin x hence y''=\frac{3}{2}\sin x+\frac{3}{2}\sin x+\frac{3}{2}x\cos x=3\sin x+\frac{3}{2}x\cos x. Then y''+y=3\sin x+\frac{3}{2}x\cos x-\frac{3}{2}x\cos x=3\sin x so y is a solution.

D.y'=-3\sin x and y''=-3\cos x, then y''+y=0 thus y isn't a solution

E. y'=\frac{3}{2}\sin x+\frac{3}{2}x\cos x hence y''=\frac{3}{2}\cos x+\frac{3}{2}\cos x-\frac{3}{2}x\sin x=3\cos x-\frac{3}{2}x\cos x. Then y''+y=3\cos x-\frac{3}{2}x\cos x-\frac{3}{2}x\cos x=3\cos x\neq 3\sin x then y is not a solution.

3 0
3 years ago
Simplify expression: <br><br> 3(4x-5) + 4(2x+6)
SVEN [57.7K]
3(4x-5)+4(2x+6)

Distribute.

12x-15+8x+24

12x+8x= 20x

24-15= 9

20x+9 <---- simplified expression

I hope this helps!
~kaikers
6 0
3 years ago
Read 2 more answers
Help me please.......... Will Give Brainlest if right
Zigmanuir [339]

Answer:

The answer would be C) 64 and 112

Step-by-step explanation:

If you go through each answer and find which perimeters they would have, you would get 108 for A, 312 for B, 352 for C, and 372 for D. The question says the perimeter is equal to 352 therefore C is the answer.

6 0
2 years ago
Help please this is due tomorrow and I need this done
sukhopar [10]

The answer is G. as per absolute value.

5 0
3 years ago
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