3 years ago

Helppppppppppplszzzz

Mathematics

2 answers:

pshichka [43]3 years ago

8 0

Answer:

3x=15

Step-by-step explanation:

3(5)=15 it's the only one where x can be 5

Slav-nsk [51]3 years ago

4 0

Plug x = 5 into all the equations
A: 2 + 5 = 3 (false)
B: 3(5) = 15 (true)
C: 5/2 = 10 (false)
D: 5 - 7 = 12 (false)

Solution: B

You might be interested in

A conical tank (with vertex down) is 10 feet across the top and 12 feet deep. If water is flowing into the tank at a rate of 10

just olya [345]

Answer:

$\frac{dh}{dt}$ ≅ $0.286\frac{ft^{3} }{min}$

Step-by-step explanation:

$V=\frac{\pi }{3}r^{2}h$ ; rate of change $\frac{dV}{dt}=10\frac{ft^{3} }{min}$ , we must find the rate of change of the depth $\frac{dh}{dt} =?;h=8ft$

5h=12r; $V=\frac{\pi }{3}\({\((5h}/12} )} ^{2}h=\frac{\pi }{3}(\frac{25h^{2} }{144})h; V=\frac{25\pi h^{3}}{432}$ ; deriving $\frac{dV}{dt} = \frac{25\pi }{432}(3h^{2})\frac{dh}{dt}$ → $10=\frac{25\pi h^{2}}{144} \frac{dh}{dt}$ → h=8 then $\frac{dh}{dt}=\frac{1440}{25\pi 64}=\frac{9}{10\pi}$ ≅ 0.286 $\frac{ft^{3} }{min}$