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3 years ago

What is the total surface area when the radius is 19 and height is 21mm please answer QUICK

Mathematics

1 answer:

asambeis [7]3 years ago

4 0

Answer:

Its simple.

Step-by-step explanation:

Add Jerome to the 78 and then 1/4 of molly to get your answer.

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An architect wants to draw a rectangle with a diagonal of 15 centimeters. The length of the rectangle is to be 6 centimeters mor

S_A_V [24]

Answer:

She should make a rectangle with dimensions 14.4 cm by 4.2 cm.

Step-by-step explanation:

The diagonal of a rectangle is represented by $\sqrt{length^2+width^2}$ .
Area of rectangle is = length×width
Perimeter of a rectangle = 2(length+width).

Assume x be the width of the rectangle.

The length of the rectangle is to be 6 cm more than twice the width.

The length of the rectangle is= (2x+6) cm

Then the diagonal of the rectangle is $\sqrt{length^2+width^2}$

$=\sqrt{(2x+6)^2+x^2}$

$=\sqrt{4x^2+24x+36+x^2}$

$=\sqrt{5x^2+24x+36}$ cm

According to the problem,

$\sqrt{5x^2+24x+36}=15$

Squaring both sides

$\Rightarrow{5x^2+24x+36}=15^2$

$\Rightarrow{5x^2+24x+36}=225$

$\Rightarrow{5x^2+24x+36-225=0$

$\Rightarrow{5x^2+24x-189=0$

⇒5x²+45x-21x-189=0

⇒5x(x+9)-21(x+9)=0

⇒(x+9)(5x-21)=0

⇒x+9=0 or, 5x-21=0

$\Rightarrow x=-9, \frac{21}5$

⇒x= -9, 4.2

Since the width of a rectangle can not negative.

So, x=4.2 cm

The width of rectangle is = 4.2 cm

The length of the rectangle is =(2×4.2+6)

=14.4 cm

She should make a rectangle with dimensions 14.4 cm by 4.2 cm.

8 0

3 years ago

It took Michael 279 hours to drive home because of traffic. His sister drove the same distance in 12 of Michael’s time. How long

NemiM [27]

23.25 hours because if you can divide 279 hours (michael) divided by 12, you would get 23 hours and 25minutes

6 0

3 years ago

Express each rational number as a fraction or mixed number in simplest form. 25

Sloan [31]

25 expressed as a mixed number is just 25

-Hunter

4 0

3 years ago

Pleaseee helpppp:)))

matrenka [14]

Answer:

<h2>Option B:</h2><h3>112 families </h3>

Step-by-step explanation:

Given,

No. of families = 75

Out of 75 no. of families had cars = 42

Out of 1, no. of families can have cars

$= \frac{42}{75}$

Therefore, 

Out of 200 families, no. of families had cars

$= 200 \times \frac{42}{75}$

$=200 \times \frac{14}{25}$

= 8 × 14

= 112

Hence, 

option B is correct as 112 families have cars out of 200 families (Ans)

5 0

3 years ago

What is 6.86 6.8 7 6.9 6.827 from least to greatest

Nikitich [7]

Answer:

ITS 1, 2, 3, 4, 5 HOW MANY DOGS ARE IN MY BASEMENT WATCHING DORA THE EXPLORA

Step-by-step explanation:

4 0

3 years ago