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yulyashka [42]
3 years ago
7

Can anybody help me

Mathematics
1 answer:
soldier1979 [14.2K]3 years ago
3 0

Answer:65

Step-by-step explanation:

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Ernest worked 10 1/2 hours this weeks and earns $9.20 per hour. How much did he earn this week?
butalik [34]

Answer:

$96.60

Step-by-step explanation:

9.20/1 = x/10 1/2

7 0
3 years ago
What is the volume of a hollow ball whose other radius is 200m and inner radius of 100m? What is the mass if it is iron?
kati45 [8]

Solution :

Volume of ball = Volume of outer ball - Volume of inner ball

V = \dfrac{4\pi R^3}{3} - \dfrac{4 \pi r^3}{3}\\\\V = \dfrac{4\pi}{3}( R^3 - r^3 )\\\\V = \dfrac{4\pi}{3}( 200^3 - 100^3 )\\\\V = \dfrac{4\pi}{3}(2^3 - 1^3) \times 10^6\\\\V = 2.93 \times 10^7 \ m^3

Now, density of iron is, d = 7300 kg/m³.

So, mass of iron ball is :

m = d\times V\\\\m = 7300\times 2.93 \times 10^7 \ kg\\\\m =  2.14 \times 10^{11}\ kg

Hence, this is the required solution.

5 0
3 years ago
Find BC if segment AD is an altitude of triangle ABC PLEASE HELP
Vedmedyk [2.9K]

Answer:

BC = 96

Step-by-step explanation:

Since AD is an altitude, then ∠ ADC = 90° , thus

4x + 10 = 90 ( subtract 10 from both sides )

4x = 80 ( divide both sides by 4 )

x = 20

Thus

BC = BD + DC

     = 2x + 3x - 4

    = 5x - 4

    = 5(20) - 4 = 100 - 4 = 96

3 0
3 years ago
Phillip is standing across the classroom from his desk. He walks x steps in a straight line to his right, turns left at a 90° an
Rainbow [258]
For this case, we can model the problem as a triangle with a right angle.
 Where,
 x, y: lengths of the sides of the triangle
 d: hypotenuse of the triangle
 We then have the following relationship:
 d ^ 2 = x ^ 2 + y ^ 2

 Clearing d we have:
 d = \sqrt{ x^2 + y^2}
 Answer:
 
A functions that would best model the situation above is:
 
D square root
6 0
4 years ago
Gym A charges $60 a month plus $5 per visit. The monthly cost at Gym B is represented by y = 7x + 40, where x is the number of v
Anarel [89]

Answer:

See the explanation

Step-by-step explanation:

Given data

Gym A charges $60 a month plus $5 per visit

let the number of visits be x, and the total charge be y

Hence the total charge is expressed as

y=5x+60--------------1

Gym B is represented by

y = 7x + 40-----------2

Although I can not find any option, we can conclude that gym A monthly charge is $20  more expensive than gym B

6 0
3 years ago
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