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Sloan [31]
3 years ago
12

Solve 5r2 – 12 = 68. {±4} {±5} {±3} {±6}

Mathematics
2 answers:
djyliett [7]3 years ago
7 0
5r2-12=68
+12 +12
5r2 = 80
-80
5r2 -80 = 0
÷5 ÷5 ÷5

r2 -16 = 0
+16 +16
r2 = 16

root: r2 = root: 16
r = {+/- 4}

Airida [17]3 years ago
3 0

Add 12 to both sides:

5r^2 = 80

Divide by 5:

r^2 = 16

Square root both sides:

r = +/- 4

The answer is {+/- 4}.

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15 players two coaches and 21 parents attend this year sports banquet the cost of each meal was $12 +5% sales tax what was the t
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Answer:

$478.80

Step-by-step explanation:

We have been given that 15 players two coaches and 21 parents attend this year sports banquet the cost of each meal was $12 plus 5% sales tax.

First of all, we will find cost of each meal with tax as:

\text{Cost of each meal with tax}=\$12+\$12\times \frac{5}{100}

\text{Cost of each meal with tax}=\$12+\$12\times 0.05

\text{Cost of each meal with tax}=\$12+\$0.6

\text{Cost of each meal with tax}=\$12.6

Now, we will find total persons at the sport banquet as:

\text{Total persons at banquet}=15+2+21

\text{Total persons at banquet}=38

To find the total cost of food for the banquet, we will multiply cost of food for each person by 38.

\text{Total cost of food for the banquet}=\$12.6\times 38

\text{Total cost of food for the banquet}=\$478.8

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3 years ago
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Answer:

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Step-by-step explanation:

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8 0
3 years ago
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Step-by-step explanation:

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3 years ago
NEED HELP ASAP!! WILL MARK BRAINLIEST!!
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Step-by-step explanation:

The Chord Intersection Theorem:

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By the above theorem : 2 * 4 = 2.5 * ED

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3 years ago
Graph -y + 5x = 0.<br> Please help
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This is the correct graph.
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3. Draw the line that connects the two points.

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3 years ago
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