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3 years ago

Ok guys last question so PLEASE get this right!!! (no links or reported)

Mathematics

2 answers:

olasank [31]3 years ago

7 0

2 inch is 10 miles

0.5 inch is 2.5 miles

so it is 12.5 square miles?

satela [25.4K]3 years ago

6 0

Answer:

156.25 square miles

Step-by-step explanation:

set up a proportion:

1/5 = 2.5/x

cross-multiply to get 'x'

x = 12.5

To get area you must square 12.5

12.5² = 156.25 square miles

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Alex scored 98,72, and 87 on his first three math test. What must he score on the next test to have an average of at least 86 (P

ss7ja [257]

Answer:

$\huge\boxed{\text{At least an } 87\%}$

Step-by-step explanation:

In order to find what score Alex must earn to have an average of 86 on all his tests, we need to first note what the formula to find the average of a data set is.

$\displaystyle \frac{x_1+x_2+...x_n}{n}$

What the formula means is that we have to add up all the values then divide by the total number of values.

Let's represent our unknown number as $x$ .

$\displaystyle \frac{98+72+87+x}{4} \geq 86$ (since we want AT LEAST an 86).

Let's solve this inequality for x.

$\frac{98+72+87+x}{4} \cdot 4 \geq 86 \cdot 4$
$98+72+87+x \geq 344$
$257 + x \geq 344$
$257 + x - 257 \geq 344 - 257$
$x \geq 87$

So, Alex must score at least an 87% on his next quiz to have an average of 86%.

Hope this helped!

8 0

3 years ago

Solve for x. Round to the nearest tenth, if necessary.

serg [7]

Answer:

x = 8.8

Step-by-step explanation:

take 20 degree as reference angle .the,

hypotenuse = OQ = x (hypotenuse is always opposite of 90 degree)

perpendicular(opposite) = PQ 3 (opposite of reference angle is perpendicular or also called as opposite)

base(adjacent) = OP (side which lies on the same line where 90 degree and reference angle)

using sin rule

sin 20 = opposite / hypotenuse

0.34 = 3 / x

x = 3/0.34

x = 8.82

x = 8.8

4 0

3 years ago

Read 2 more answers

Toms math teacher asks 6 is 20 percent of what number tom incorrectly says 120 what’s is the correct number

Setler79 [48]

6=20% * n

6 = .20 * n

divide by .20

6/.2 = n

30 =n

Answer: 30

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4 years ago

Jerry thought four DVDs $425.20. What was the unit rate?

Romashka-Z-Leto [24]

the answer is 106.30

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3 years ago

I need help on the third question.

Ilia_Sergeevich [38]

You need 140 tens blocks

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4 years ago