3 years ago

The product of 9, and a number increased by 7, is 126. What is the number

Mathematics

1 answer:

RoseWind [281]3 years ago

6 0

Answer:

The number is 7.

Step-by-step explanation:

The unknown number: x

9 (x + 7) = 126

Using the distributive property, 9x + 63 = 126

9x = 63

x = 7

You might be interested in

List in order the specific operations that you would use to isolate X in the following equation show the step that corresponds t

loris [4]

7 + 3.(2 - 3x) = 67
3 brackets are distributed

7+6-9x = 67
13-9x = 67
-9x = 67
x = 67/-9

8 0

3 years ago

What is the slope of the line through<br><br> (-8, 10) and (6, 10)?

steposvetlana [31]

Answer:

the slope is 0

Step-by-step explanation:

m=0

4 0

2 years ago

Read 2 more answers

Multiply 6+2i and it’s conjugate. Simplify. <br><br> Help me please ASAP

vlabodo [156]

Answer:

Step-by-step explanation:

(6 + 2i)(6 – 2i) = 36 – 4i²

= 36 + 4 = 40

7 0

2 years ago

Lily says that (2+i)" is a complex number for every positive integer value of n. Explain how you

vfiekz [6]

Lily is not correct her answer is wrong.

3 0

2 years ago

A detective finds a victim of murder at 9 am. At that time, the temperature of the body is 90.3 degrees F. One hour later, the b

LekaFEV [45]

Answer:

Step-by-step explanation:

Given

at 9 am temperature of the body is $90.3^{\circ}F$

1 hr later temperature $89^{\circ}F$

Temperature of room $T=68^{\circ}F$

According to newtons law

$\frac{\mathrm{d} T}{\mathrm{d} t}=-k\left ( T-T_{room}\right )$

$\frac{\mathrm{d} T}{\mathrm{d} t}=-k\left ( T-68\right )$

$\frac{dT}{T-68}=-kdt$

Integrating

$=\int \frac{dT}{T-68}=-kdt$

$\ln |T-68|=-kt+c$

$T-68=Ae^{-kt}$

Now at 9 am i.e. t=0,

$90.3=A+68$

$A=22.3$

At 10 am i.e. t=1 hr T=89

$89-68=22.3e^{-k}$

$e^{-k}=21$

$k=0.06006$

Temperature of Normal human body is $T=98.6 ^{\circ}F$

$98.6-68=e^{-0.06006t}$

$30.6=e^{-0.06006t}$

Taking log both sides

$t=-5.27$

i.e. 5 hr and 16.2 min

i.e. victim murdered at 3 am and 43.8 min

7 0

2 years ago