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murzikaleks [220]
3 years ago
8

How much times dose 30 go into 90

Mathematics
2 answers:
Oduvanchick [21]3 years ago
8 0

Answer:

3

Step-by-step explanation:

30+30+30=90

that 3 times

r-ruslan [8.4K]3 years ago
3 0

Answer:

*does and 3 genius use a calculator or common sense

Step-by-step explanation:

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John was driving 58 miles per hour. if he was to drive the same speed for 7 hours how many miles would he drive.
lara [203]

Answer: <em>58x7=</em>406 miles<em> i think:)</em>

8 0
3 years ago
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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
there are 3 boys and 2 girls in the Krunch family.Mr.Krunch bought 3 1/2 pounds of candy to divide equally among them.How much c
user100 [1]
In total there are 5 kids so
5÷3.5=1.4
(rounded)

7 0
3 years ago
6th grade math help me please ! :))
Stells [14]

Answer:

1,825 days

Step-by-step explanation:

730 / 2 = 365 (one year, or the number of days a single revolution around the sun takes)

Now just multiply by 5

[365 · 5 = 1,825], thus 1,825 days are the duration of 5 revolutions.

The problem could also be initially expressed as:

x = (720/2) · (5) with x representing the missing value

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A housekeeper had 4/5 of a spray bottle of a cleaning solution. He used 1/8 of the solution in a day.How much of the bottle did
valina [46]

Answer:

0.1

Step-by-step explanation:

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