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3 years ago

Mark practices his guitar 3/4 hours each day. How many hours does he practice in seven days?

Mathematics

1 answer:

Mashutka [201]3 years ago

6 0

3/4 *7
or
0.75*7
The answer is 5.25

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What angle does a semicircle have

dolphi86 [110]

Assuming you mean the central angle, semicircles have central angles of $\boxed{180 ^{\circ}}$ .

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2 years ago

Read 2 more answers

Writing to explain what are compatible numbers? What compatible numbers would you pick to estimate the diferrent of 777-248? Why

Sphinxa [80]

Compatible numbers are rounded numbers. the compatible number for 777 is 800 , and the compatible number for 248 is 200 because I rounded to the nearest hundreds place

I hope I helped you!!!!<3

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2 years ago

Mr. Baker wants to divide his class into smaller, equal-sized groups of students.However, he finds that his class cannot be divi

Elis [28]

Answer:

Prime. Prime numbers can only be divided by the whole number, or one.

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2 years ago

A CD with a diameter of 120 millimeters rotates a rate of 45 revolutions per minute. Find the linear speed of the CD in millimet

ale4655 [162]

9514 1404 393

Answer:

16,965 mm/min
90π ≈ 282.7 radians/min

Step-by-step explanation:

The circumference of the CD is ...

C = πd

C = π(120 mm) ≈ 376.99 mm

This is the distance a point on the edge of the CD will travel when making one revolution. It will travel 45 times this far when making 45 revolutions:

(376.99 mm/rev)(45 rev/min) ≈ 16,965 mm/min

There are 2π radians in each revolution, so the angular speed is ...

(2π rad/rev)(45 rev/min) = 90π rad/min ≈ 282.7 rad/min

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2 years ago

<img src="https://tex.z-dn.net/?f=4x%5E%7B2%7D%20%2B4x%2B1%3D0" id="TexFormula1" title="4x^{2} +4x+1=0" alt="4x^{2} +4x+1=0" ali

Arturiano [62]

$D=b^2-4ac\\D=4^2-4(4)(1)\\D=16-16\\D=0$

Meaning there's only 1 real root, complete the square and you get the answer.

$(x+y)^2=x^2+2xy+y^2$

We're going to use this formula, so if x² = 4x² then x = 2x

and if y² = 1 then y = 1

Straight to formula

$(2x+1)^2=0\\x=-\frac{1}{2}$

Because (2x+1)² is basically (2x+1)(2x+1), we get the same value of x.

So the answer is x = -1/2

(When D>0, there are 2 real roots.)

(When D=0, there are only 1 real root.)

(When D<0, there are no real roots, but 2 complex roots.)

8 0

3 years ago