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4 years ago

Seven less than an unknown number

Mathematics

1 answer:

Sauron [17]4 years ago

7 0

Answer:

x-7

Step-by-step explanation:

unknown number = x

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Chelsea completes 35 math problems in 7 min.

Andru [333]

Answer = 5 problems per minute

Because you do the number of problems divided by the minutes eg 35/7 = 5

3 0

4 years ago

ILL GIVE BRAINLIEST

bixtya [17]

Answer:

The answer is B

Step-by-step explanation:

If you look at the graph, you can look at number of tickets and see that to get 10 tickets, you would get charged 80 dollars not 88, so the answer is B

8 0

3 years ago

What number must you add to the polynomial below to complete the square?<br><br> x2 + 15x

Aleksandr-060686 [28]

Answer:

The number $\frac{225}{4}$ is added to the polynomial below to complete the square.

Step-by-step explanation:

Perfect square binomial:

A perfect square binomial is given by:

$(a + b)^2 = a^2 + 2ab + b^2$

In this question:

We have that:

$a^2 + 2ab + b^2 = x^2 + 15x + ?$

Since $a = x$ , we have that:

$2ab = 15x$

$2b = 15$

$b = \frac{15}{2}$

Completing the square:

The term that completes the square is $b^2$ . So

$b^2 = (\frac{15}{2})^2 = \frac{225}{4}$

The number $\frac{225}{4}$ is added to the polynomial below to complete the square.

4 0

3 years ago

A given field mouse population satisfies the differential equation dp/dt=.4p-450 where p is the number of mice and t is the time

Flura [38]

Answer:

a) 7.78 months

b) 1116

Step-by-step explanation:

Given -

$\frac{dP}{dt} = 0.4p-450$

Integrating the above equation with respect to time, we get -

$\int\ \frac{dP}{0.4p-450} = \int\ dt\\$

let us define new variable x

$x = 0.4p - 450 \\dx = 0.4 dy$

substituting these values in above integral equation, we get -

$\frac{1}{0.4} \int\ \frac{dx}{x} = \int\ dt\\ln x = 0.4 t + C\\x = ce^{0.4t}$

$P (t) = \frac{C}{0.4} e^{0.4t} +1125\\$

at t = 0, P (0) = 1075, using this condition, we get -

$\frac{c}{0.4} = -50\\P(t) = 50 e^{0.4t} +1125 \\t = 7.78\\P(0) = 1125 - \frac{1125}{e^{4.8}} = 1116$

7 0

3 years ago

Use the substitution method to solve the system of equations. Choose the correct ordered pair.x + y = 5 y = 7

viktelen [127]

First we put 7 in the place of y, after that subtract 7 from both sides, the answer is -2.
x + y= 5 y = 7
x+ 7=5
x= 5-7
x = -2

5 0

4 years ago

Seven less than an unknown number ​

Seven less than an unknown number