All categories

4 years ago

There are eight pencils in a package. How many packages will be needed for 28 children if each child gets 4 pencils?

Mathematics

2 answers:

eduard4 years ago

6 0

14 packages
28(children) × 4(pencils) = 112(pencils)
112(pencils) ÷ 8(pencils per package) = 14(packages)

zimovet [89]4 years ago

3 0

Seven because 4x7 equals 28

You might be interested in

Use this graph to answer these questions.

snow_lady [41]

The answer is D I think

5 0

3 years ago

Find the values of the sine, cosine, and tangent for

Zepler [3.9K]

Number 1 i believe because the sin has to be multiplied

4 0

3 years ago

How to simplify 25x^{2} + 49

Maksim231197 [3]

Answer:

5²x²- 49

Factoring: 25x2-49

A difference of two perfect squares, A²- B²can be factored into (A+B) • (A-B)

Proof : (A+B) • (A-B) =

A²- AB + BA - B²=

A² - AB + AB - B² =

A²- B²

25 is the square of 5

49 is the square of 7

x²is the square of x¹

(5x + 7) • (5x - 7)

6 0

3 years ago

Find the maximum height of the cannon ball (t)= -16t + 128t

Bond [772]

Answer:

t= 0

Step-by-step explanation:

Isolate the variable by dividing each side by factors that don't contain variables.

5 0

3 years ago

A three inch diameter pulley on an electric motor that runs at 1800

Bezzdna [24]

Answer:

a) 3 inch pulley: 11,309.7 radians/min

6) 6 inch pulley: 5654.7 radians/min

b) 900 RPM (revolutions per minute)

Step-by-step explanation:

Hi!

When a pulley wirh radius R rotantes an angle θ, the arc length travelled by a point on its rim is Rθ. Then the tangential speed V is related to angular speed ω as:

$V=R\omega$

When you connect two pulleys with a belt, if the belt doesn't slip, each point of the belt has the same speed as each point in the rim of both pulleys: Then, both pulleys have the same tangential speed:

$\omega_1 R_1 = \omega_2 R_2\\$

$\omega_2 = \omega_1 \frac{R_1}{R_2} =1800RPM* \frac{3}{6}= 900RPM$

We need to convert RPM to radias per minute. One revolution is 2π radians, then:

$\omega_1 = 1800*2\pi \frac{radians}{min} = 11,309.7\frac{radians}{min}$

$\omega_2 = 5654.7 \frac{radians}{min}$

The saw rotates with the same angular speed as the 6 inch pulley: 900RPM

3 0

4 years ago