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3 years ago

A classroom has 3 rows of desks. There are 5 desks in each row. How many desks are there altogether?

Mathematics

2 answers:

kicyunya [14]3 years ago

4 0

The answer is 15 because you multiply 5×3=15

miss Akunina [59]3 years ago

3 0

if their are 3 rows and 5 desks per row so 5*3 = 15 desks

ANSWER: 15 DESKS

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A rectangle has a length this is three times its width. If the area of the rectangle is 27 square feet, what are the dimensions

yuradex [85]

Answer:

The width of the rectangle is 3 and the width is 9. Those are reasonable measurements.

Step-by-step explanation:

6 0

3 years ago

Use a system of equations to solve this problem. Dr. Graham currently has two acid solutions. She only has a 60% acid solution a

Natalka [10]

<span>Dr. Graham currently has two acid solutions.
60% acid AND 20% acid </span>
Dr. Graham needs 30 L of a 50% acid solution
We set up 2 equations in which s = 60% acid and t = 20% acid
A) s + t = 30
B) .60s + .20t = (.50 * 30)
We multiply equation A by -.20
A) = -.20s -.20t = -6 then we add it to B)
B) .60s + .20t = 15
.40s = 9
s = 22.5
t = 7.5
So, she needs to mix 22.5 liters of 60% acid with 7.5 liters of 20% acid.

Source:
http://1728.org/mixture.htm

4 0

2 years ago

What is the purpose of living will

Shtirlitz [24]

To reproduce. But if this is suicidal type there are people here for you

4 0

3 years ago

I totally need helppppppppp. Oh no im gonna faillllllll.

brilliants [131]

Answer:

19 will be the answer.

Step-by-step explanation:

10+9=19

8 0

3 years ago

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Find the volume of the solid, please

dsp73

Answer:

$V \approx=1436.8$

Step-by-step explanation:

Variables and symbols:

r = radius
V = volume
A = surface area
C = circumference
π = pi = 3.1415926535898
√ = square root

Volume of a sphere in terms of radius:

$V = \frac{4}{3}\pi r^3$ , $V \approx 4.1888r^3$

To calculate the volume of a sphere:

Usually the hardest part is measuring or estimating the diameter of the sphere. Special tools exist for smaller parts like balls in ball-bearings, but it gets more complicated if the size is large. Knowing that the diameter is the largest internal measurement you can take should help.

Once you have the measurement, to find the volume use the formula above, in which π is the well-known mathematical constant equal to about 3.14159. To adjust for a half-sphere calculation, just divide the result by two.

Spheres and half-spheres are useful in engineering and architecture due to their property of being able to take equal amounts of pressure or force from each direction.

Solution:

$V=\frac{4}{3} \pi r^{3} =\frac{4}{3} *\pi *7^{3} \approx1436.75504$

Round to nearest tenth: $1436.8$

5 0

1 year ago

Read 2 more answers