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MariettaO [177]
3 years ago
11

Which is the area of a rectangle with a length of 21 feet and a width of 15 feet?

Mathematics
2 answers:
nexus9112 [7]3 years ago
8 0

Answer:

315 ft ²

Step-by-step explanation:

The formula for the area of a rectangle is Area=Length × Width

Area=21×15

Area=315 ft ²

MA_775_DIABLO [31]3 years ago
3 0

Answer:

315

Step-by-step explanation:

Area = Length x Width

Area = 21 x 15

Area = 315

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NISA [10]

Answer:

x = 19

Step-by-step explanation:

(whole secant) x (external part) = (tangent)^2

(x-7+4) * 4 = 8^2

(x-3)*4 = 64

Divide each side by 4

x-3 =16

Add 3 to each side

x-3+3 = 16+3

x = 19

5 0
3 years ago
A = √7 + √c and b = √63 + √d where c and d are positive integers.
mrs_skeptik [129]

Answer:

\displaystyle a:b=\frac{1}{3}

Step-by-step explanation:

<u>Ratios </u>

We are given the following relations:

a=\sqrt{7}+\sqrt{c}\qquad \qquad[1]

b=\sqrt{63}+\sqrt{d}\qquad \qquad[2]

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From [3]:

9c=d

Replacing into [2]:

b=\sqrt{63}+\sqrt{9c}

We can express 63=9*7:

b=\sqrt{9*7}+\sqrt{9c}

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b=3\sqrt{7}+3\sqrt{c}

Factoring:

b=3(\sqrt{7}+\sqrt{c})

Find the ration a:b:

\displaystyle a:b=\frac{\sqrt{7}+\sqrt{c}}{3(\sqrt{7}+\sqrt{c})}

Simplifying:

\boxed{a:b=\frac{1}{3}}

3 0
3 years ago
10(a-2.5+0.56b) is this equivalent to 10a - 25+56b
kirill115 [55]

Hey there!

10(a - 2.5 + 0.56b)

= 10(a) + 10(-2.5) + 10(0.56b)

= 10a - 25 + 5.6b

= 10a + 5.6b - 25

Therefore, your answer is: 10a + 5.6b - 25

Good luck on your assignment and enjoy your day!

~Amphitrite1040:)

3 0
3 years ago
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Step2247 [10]

Answer:

i think your question is missing something??

Step-by-step explanation:

3(4) + 6 = 7 (2(4)-3)

12 + 6 = 7 (8-3)

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8 0
3 years ago
Find the area of r = 4.5
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<span><span><span><span><span><span><span><span>here ya go 14.13</span></span><span><span /></span><span><span><span><span>m</span></span></span><span><span><span>2 </span></span></span></span></span></span></span></span></span></span><span>A≈14.13⁢m2</span>
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