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3 years ago

If X=5, Y=3, then solve: 2X - (Y^-2) + 10 =

Mathematics

1 answer:

Sedbober [7]3 years ago

8 0

Answer:

Step-by-step explanation:

10-(-9)+10---} 10+9+10

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Over 44% of the 30 students in a class read a

Yakvenalex [24]

Answer:

I got 13.2 but you could probably round it to 13.

Step-by-step explanation:

44 percent *30 =

(44:100)*30 =

(44*30):100 =

1320:100 = 13.2

5 0

3 years ago

If Sn=2^n-1<br><br>what's the expression of<br>Sn-1?

Naya [18.7K]

Answer:

$S(n-1)=2^{n-2}$

Step-by-step explanation:

Given that,

The value of $S_n=2^{n-1}$

We need to find an expression for $S(n-1)$ . To find it, put the value of n as (n-1). So,

$S_{n-1}=2^{n-1-1}\\\\=2^{n-2}$

Hence, the value of S(n-1) is equal to $2^{n-2}$ .

4 0

3 years ago

Sarah rolls a die twice. What is the probability that she rolls a 3 and then an even number?

vekshin1

Answer:

A) 1/12

Step-by-step explanation:

The sample space of rolling a die is { 1,2,3,4,5,6}

P (getting 3)= The number of "3"'s in the sample space over the number of items in the sample space

P (getting a 3} = 1/6

P (getting even)= The number of evens in the sample space over the number of items in the sample space

P (getting an even} = 3/6= 1/2

Since these are independent events, we multiply the probabilities

P(3, even) = 1/6 * 1/2 = 1/12

6 0

3 years ago

Read 2 more answers

An 16 16-oz jar of peanut butter in the shape of a right circular cylinder is 7 7 in. high and 5 5 in. in diameter and sells fo

olya-2409 [2.1K]

Answer:

Step-by-step explanation:

The formula for determining the volume of a cylinder is expressed as

Volume = πr²h

Where

r represents the radius of the cylinder.

h represents the height of the cylinder.

π is a constant whose value is 3.14

Considering the 16 oz jar,

h = 7 inches

Diameter = 5 inches

Radius = diameter/2 = 5/2

r = 2.5 inches

Volume = 3.14 × 2.5² × 7 = 137.375 inches³

Considering the 29 oz jar,

h = 7.5 inches

Diameter = 5.25 inches

Radius = diameter/2 = 5.25/2

r = 2.625 inches

Volume = 3.14 × 2.625² × 7.5 = 162.27 inches³

1) If the cost is directly proportional to volume, then

If 137.375 inches³ cost $1.6

then 162.27 inches³ should cost

(162.27 × 1.6)/137.375 = $1.89

The price of the larger jar would be $1.89

2) If the cost is directly proportional to weight, then

If 16 oz cost $1.6, then

29 oz would cost

(29 × 1.6)/16 = $2.9

The price of the larger jar would be $2.9

7 0

3 years ago

Please help I found this one a bit confusing

Brums [2.3K]

Answer:

7.2

Step-by-step explanation:

To reach point D from point C, you need to add 4 to the x-value of point C and take away 6 from the y-value. These numbers are the sides of the hypothetical triangle.

The Pythagorean Theorem states that $a^2+b^2=c^2$ . If we plug the side lengths in for a and b, we get $4^2 + 6^2 = c^2$ . This can be simplified to $16+36=c^2$ , or $52 = c^2$ . If we root both sides, we find that c is equal to $\sqrt{52}$ , which is slightly more than 7, at around 7.2.

4 0

2 years ago