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3 years ago

10 POINTS!!!

Mathematics

2 answers:

professor190 [17]3 years ago

6 0

Answer:

Area of the table = 630 inch square

Step-by-step explanation:

Area of a trapezoid = a+b/2 *h

Area of the table = 60+30/2 *14= 45*14= 630 in square

ale4655 [162]3 years ago

5 0

Answer:

630

Step-by-step explanation:

A=(a+b/2)h

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The Radius of a circle is 5 cm. Find the area of the circle, correct to one decimal place.

lorasvet [3.4K]

Answer:

78.5

Step-by-step explanation:

$r^{2}$ x3.14 (pie)

so then substitute.

5x5=25

25x3.14=78.5

6 0

2 years ago

6 sweets cost 24p all together how much do 5 sweets cost

Vlada [557]

Cost of 6 sweets = 24p

so, cost of 1 sweet = 24p/6 = 4p

Now, cost of 5 sweets will be =4p*5 = 20p

3 0

3 years ago

Find the sum 12x^2+9x^2

katen-ka-za [31]

Let's simplify step-by-step.
12x^2+9x^2
Combine Like Terms:
=12x^2+9x^2
=(12x^2+9x^2)
=21x^2

5 0

2 years ago

(3) Two people are at an elevator. At the same time one person starts to walk away from the elevator at a rate of 2 ft/sec and t

Gekata [30.6K]

Answer:

The rate at which the distance between the two people is changing 15 seconds later is 7.28 ft/sec.

Step-by-step explanation:

Here, we note the following

Let the person walking way fom the elevator be X

Let the other person going up in the elevator be Y

Therefore after 15 seconds, their positions will be;

For X, 2 ft/sec × 15 s = 30 ft away from the elevator

For Y, 7 ft/sec × 15 s = 105 ft up in the elevator

At that instant, the distance between them is given as

d² = x² + y²

= 30² +105² = 11925 ft²

d = √11925 ft² = 109.202 ft

The rate of change of the distance between the two peopl, X and Y is given as

$\frac{dd^2}{dt} = \frac{dx^2}{dt} + \frac{dy^2}{dt}$

Therefore, $2d\frac{dd}{dt} = 2x\frac{dx}{dt} + 2y\frac{dy}{dt}$ or $d\frac{dd}{dt} = x\frac{dx}{dt} + y\frac{dy}{dt}$

Since $\frac{dx}{dt}$ is given as 2 ft/sec and $\frac{dy}{dt}$ = 7 ft/sec

Then $d\frac{dd}{dt} = 30 \times 2 + 105 \times 7 = 795\\$

$\frac{dd}{dt} = \frac{795}{109.202 } =7.28 ft/sec$

8 0

2 years ago

Read 2 more answers

What is the value of x using the Pythagorean theorem?

Vesnalui [34]

A^2+b^2= c^2

Plug in the points. the longest side is always c.

95.2^2+ b^2= 168^2.

Square the numbers.

9063.04+ b^2= 28224

Subtract 9063.04 on both sides.

b^2= 19160.96

Find the square root.

b= 138.423119456

Or, b= 138.4 (rounded down)

I hope this helps!
~kaiker

8 0

2 years ago