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3 years ago

Answer ASAP pls 20 points

Mathematics

1 answer:

Inga [223]3 years ago

7 0

Answer:

I can't download

Step-by-step explanation:

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Which expression is equivalent to 3(8 + 7)? 24 + 7 24 + 21 11 + 10 11 + 7

Bumek [7]

Multiply 3&8 and 3&7, this expands it to 24 + 21.

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3 years ago

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Hello, may I please have some help on these 4 questions? Thanks very much! {Also, if you could answer them quick, that would be

wlad13 [49]

1.

Parallelogram with base a = 20 in. and height h = 16 in.
Triangle with base a = 20 in. and height b = 8 in.

so:

$A = A_P+A_T=a\cdot h+\frac{1}{2}\cdot a\cdot b=20\cdot16+\frac{1}{2}\cdot20\cdot8=320+80=\\\\=\boxed{400\text{ in}^2}$

2.

Trapezoid with base b₁ = 14 cm, base b₂ = 4 cm and height h = 10 cm
Triangle with base b₁ = 14 cm and height x = 18 cm - 10 cm = 8 cm

so:

$A=A_T+A_\Delta=\frac{1}{2}\cdot(b_1+b_2)\cdot h+\frac{1}{2}\cdot b_1\cdot x=\\\\=
\frac{1}{2}\cdot(14+4)\cdot 10+\frac{1}{2}\cdot 14\cdot8=\frac{1}{2}\cdot18\cdot 10+\frac{1}{2}\cdot 14\cdot8=90+56=\\\\=\boxed{146\text{ cm}^2}$

3.

We have three rectangles:

$A=A_1+A_2+A_3=1\cdot 4+6\cdot5+18\cdot6=4+30+108=\boxed{142\text{ ft}^2}$

4.

Area of a circle:

$A_\circ=\pi\cdot r^2=3.14\cdot5^2=3.14\cdot25=78.5 \text{ cm}^2$

Area of a rectangle:

$A_R=8\cdot 6=48\text{ cm}^2$

Area of the shaded region:

$A=A_\circ-A_R=78.5-48=\boxed{30.5\text{ cm}^2}$

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3 years ago

Kay [80]

Answer:

B. 7.k+7.3-18

Step-by-step explanation:

Distributive Property,

7 (k+3) = 7 x k + 7x 3

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3 years ago

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Pythagorean theorem, 6^2+8^2=c^2

elena-14-01-66 [18.8K]

Answer:

Step-by-step explanation:

$6^{2} + 8^{2} = c^{2}$

$36 + 64 = c^{2}$

$100 = c^{2}$

$c = 10$

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4 years ago

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Find the geometric mean of 15 and 18. Write the exact answer.

NeTakaya

$\bf \stackrel{geometric~mean}{\cfrac{15}{x}=\cfrac{x}{18}}\implies 15\cdot 18=x^2\implies 270=x^2~~
\begin{cases}
270=2\cdot 3\cdot 3\cdot 3\cdot 5\\
\qquad 2\cdot 3^2\cdot 3\cdot 5\\
\qquad 30\cdot 3^2
\end{cases}
\\\\\\
\sqrt{270}=x\implies \sqrt{30\cdot 3^2}=x\implies 3\sqrt{30}=x$

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3 years ago

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