3 years ago

21 43 65 115 What is angle O

Mathematics

1 answer:

In-s [12.5K]3 years ago

3 0

65the answer would be 25 because you have to subtract what they gave you then subtract again by 18

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If z^2 is directly proportional to W and Z=4 when W=8

NARA [144]

Answer:

The constant of proportionality is 2.

Step-by-step explanation:

z^2 = kW where k is a constant.

When z = 4 , W = 8 so

4^2 = 8k

k = 4^2/8

= 16/8

= 2.

3 0

3 years ago

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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!

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3 years ago

Find the sales tax for three cds if each cd is $14.29 and the sales tax is 7.25%

mestny [16]

14.29 * .0725 = 1.04
1.04 * 3 = 3.12

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4 years ago

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Find the constant of variation k in the case that y varies inversely as the square of x, and y=6 when x=3.

Len [333]

K=54.....y=k/x²....6=k/9.....k=9*6....=54

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4 years ago

Stuff costs $256 today. If inflation is 2.5%, how much will it cost next year?

n200080 [17]

Answer: A

Step-by-step explanation: 256 times 2.5% is 256 times 0.025 which equals 6.4. Add 6.4 to 256

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4 years ago