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Brilliant_brown [7]

3 years ago

11

Ella’s test grades in her history class are 89, 94, 82, 84, and 98. What score must Ella make on her next test to have a mean te

st score of 90?

2 answers:

const2013 [10]3 years ago

8 0

Ella must make a 93 to create a classroom mean test score of 90

lions [1.4K]3 years ago

8 0

Answer:

93

Step-by-step explanation:

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The area of a compact disc is 452 4/7 square centimeters. What is the diameter of a compact disc ? Use 22/7 as an approximation

motikmotik

$\bf \textit{area of a circle}\\\\ A=\pi r^2~~ \begin{cases} r=radius\\ \cline{1-1} A=452\frac{4}{7} \end{cases}\implies 452\frac{4}{7}=\pi r^2\implies \cfrac{3168}{7}=\pi r^2 \implies \cfrac{3168}{7\pi }=r^2 \\\\\\ \stackrel{\pi =\frac{22}{7}}{\cfrac{3168}{7\cdot \frac{22}{7}}}=r^2\implies \cfrac{3168}{22}=r^2\implies 144=r^2\implies \sqrt{144}=r\implies 12=r \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill \stackrel{diameter=2r}{d=24}~\hfill$

6 0

3 years ago

12,548 rounded to the nearest thousand and 4,685 rounded to the nearest thousand

ehidna [41]

Answer:

12,548 rounded to the nearest thousand is 13,000 and 4,685 rounded to the nearest thousand is 5,000

Step-by-step explanation:

4 0

2 years ago

Read 2 more answers

Help me with this pls

PtichkaEL [24]

Your answer is gonna be 98. multiply all of the numbers

4 0

2 years ago

Math help What are the solutions

Westkost [7]

Answer:

x² - 4x + 12

Step-by-step explanation:

x=2+2.82843i

x=2−2.82843i

6 0

3 years ago

Given the fu8nction f(x) = 2(x + 10), find x if f(x) = 24.<br><br> A) 68<br> B) 7<br> C) 17<br> D) 2

lyudmila [28]

F(x)=2(x+10)=24
2(x+10)=24
divide 2
x+10=12
minus 10
x=2
D

6 0

3 years ago