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3 years ago

Help!! Giving brainless need help

Mathematics

2 answers:

charle [14.2K]3 years ago

4 0

Answer:

A. 15

Step-by-step explanation:

V of a right prism which this is. Is LxWxH

So 1.5x 4x2.5=15

kow [346]3 years ago

3 0

Answer:

A. 15 cubic units

Step-by-step explanation:

Volume = length × width × height

V = lwh

V = 4 × × 1 1/2 × 2 1/2

There are two fractions here. Convert them to improper fractions to make the multiplication easier on yourself

(Denominator × whole number + numerator)/ denoninator = improper fraction

(2 × 1 + 1)/2 = 3/2

Next fraction

(2 × 2 + 1)/2 = 5/2

Plug these improper fractions into the volume formula

V = 4/1 × 3/2 × 5/2

Any number over one is the same as writing just that number. I write it like this so it's easier to read/understand

Multiply the numerators and denominators separately

V = (4 × 3 × 5)/(1 × 2 × 2)

V = (12 × 5)/(2 × 2)

V = (60)/(4)

V = 60/4

Simplify (Both the numerator and denominator can be evenly divided by 4)

V = (60 ÷ 4)/(4 ÷ 4)

V = 15/1

Any number over one is the same as the numerator

V = 15

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PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!!

zmey [24]

Step-by-step explanation:

underneath the x axis is the minuses so you draw across from -4

4 0

2 years ago

A survey was conducted

inna [77]

Answer: 9/25 or 36%

Step-by-step explanation:

72 + 28 + 62 + 38 = 200

There are 200 people in total and 72 are youngsters who like sport cars.

So, the number of youngsters who like cars out of the total number of people is 72/200.

Now, find a greatest common divisor. In this case, the greatest common divisor is 8.

72 / 8 = 9

200 / 8 = 25

9/25 (fraction)

25 * 4 = 100

9 * 4 = 36

36/100 = 36% (percentage)

4 0

3 years ago

Read 2 more answers

NEED HELP ASAP

Anika [276]

Answer:

Y=4x+9

Step-by-step explanation:

Use rise over run to find 2 points for the slope. B is as simple as looking where the line passes y.

6 0

3 years ago

Read 2 more answers

Below are the steps to solve an equation:

otez555 [7]

Answer:

x-5=-3

Step-by-step explanation:

|x-5|+2=5

|x-5|=5-2

|x-5|=3

x-5=±3

so x-5=-3 is a correct step.

4 0

3 years ago

Suppose that a large mixing tank initially holds 500 gallons of water in which 50 pounds of salt have been dissolved. Another br

Lina20 [59]

Answer:

The differential equation for the amount of salt A(t) in the tank at a time t > 0 is $\frac{dA}{dt}=12 - \frac{2A(t)}{500+t}$ .

Step-by-step explanation:

We are given that a large mixing tank initially holds 500 gallons of water in which 50 pounds of salt have been dissolved. Another brine solution is pumped into the tank at a rate of 3 gal/min, and when the solution is well stirred, it is then pumped out at a slower rate of 2 gal/min.

The concentration of the solution entering is 4 lb/gal.

Firstly, as we know that the rate of change in the amount of salt with respect to time is given by;

$\frac{dA}{dt}= \text{R}_i_n - \text{R}_o_u_t$

where, $\text{R}_i_n$ = concentration of salt in the inflow $\times$ input rate of brine solution

and $\text{R}_o_u_t$ = concentration of salt in the outflow $\times$ outflow rate of brine solution

So, $\text{R}_i_n$ = 4 lb/gal $\times$ 3 gal/min = 12 lb/gal

Now, the rate of accumulation = Rate of input of solution - Rate of output of solution

= 3 gal/min - 2 gal/min

= 1 gal/min.

It is stated that a large mixing tank initially holds 500 gallons of water, so after t minutes it will hold (500 + t) gallons in the tank.

So, $\text{R}_o_u_t$ = concentration of salt in the outflow $\times$ outflow rate of brine solution

= $\frac{A(t)}{500+t} \text{ lb/gal } \times 2 \text{ gal/min}$ = $\frac{2A(t)}{500+t} \text{ lb/min }$

Now, the differential equation for the amount of salt A(t) in the tank at a time t > 0 is given by;

= $\frac{dA}{dt}=12\text{ lb/min } - \frac{2A(t)}{500+t} \text{ lb/min }$

or $\frac{dA}{dt}=12 - \frac{2A(t)}{500+t}$ .

4 0

3 years ago