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sweet-ann [11.9K]
3 years ago
10

I really need help on this problem!!!

Mathematics
1 answer:
AURORKA [14]3 years ago
6 0

Answer:

Step-by-step explanation:

1/4 + 5/8

= (2+5)/8

= 7/8

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Find the exact area of a circle having the given circumference. 4(√3 π) A =
Alik [6]
\bf \textit{circumference of a circle}\\\\
C=2\pi r\qquad 
\begin{cases}
r=radius\\
----------\\
C=4\sqrt{3}\ \pi 
\end{cases}\implies 4\sqrt{3}\ \pi=2\pi r
\\\\\\
\cfrac{4\sqrt{3}\ \pi}{2\pi}= \boxed{r}\\\\
-----------------------------\\\\
\textit{area of a circle}\\\\
A=\pi r^2\qquad \boxed{r}=\cfrac{4\sqrt{3}\ \pi}{2\pi}\implies A=\pi \left( \cfrac{4\sqrt{3}\ \pi}{2\pi} \right)^2
4 0
2 years ago
From the sum of 3a^2−ab−2b^2 and 2a^2+5ab−3b^2 subtract a^2−3ab−4b^2
Lubov Fominskaja [6]
(3a^2-ab-2b^2) + (2a^2+5ab-3b^2) - (a^2-3ab-4b^2)

First we distribute the negative throughout the last polynomial:

(3a^2-ab-2b^2) + (2a^2+5ab-3b^2) + (-a^2+3ab+4b^2)

Combine like terms:

4a^2 + 7ab - b^2
3 0
2 years ago
What is 3.56 x 10^-5 in standard form?
Olin [163]
0.00356 is the standard form
4 0
3 years ago
Find the magnitude of the vector with (-7, -5) and write the vector as the sum of unit vectors.
Lesechka [4]
The magnitude of vector (-7,-5) =
                         = \sqrt{ (-7)^{2} + (-5)^{2} } = \sqrt{74} = 8.6

<span>vector as the sum of unit vectors = -7 i - 5 j</span>
4 0
2 years ago
Read 2 more answers
Luke’s that seven pieces of wood on top of one another if each piece was 4/8 of a foot tall how tall was his pile
Ludmilka [50]

Answer:

6 1/2 feet or 78 inches tall

Step-by-step explanation:

You have to multiply 4/8 by 7/1

First you multiply the nominators: 4 × 7 = 28

Then you multiply the denominators: 8 × 1 = 8

So the fraction would be 28/8 and it simplifies to 7/2

You can turn it into an improper fraction by seeing how many times 2 will go into seven evenly, which would be 6 times with 1 half left over

Therefore it would be 6 1/2 feet or 78 inches tall

8 0
2 years ago
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