0.7(5x+15)=2.9 -(x+3)
3.5x+10.5=2.9-x-3
3.5x+10.5= -0.1- x
4.5x= -10.6
x= -2.3555...

Check:
0.7(5(-2.3555...) +15) = 2.9 -(x+3)
2.2555... = 2.2555...

6 0

3 years ago

1.Find the dot product of the two given vectors, u=(1,6) and v=(-5,-2) 2. Find the dot product of v=-7i+4j and w=-6i+5j

Svet_ta [14]

The dot product of the two vectors will be given as follows:
v*w=(-7i+4j)*(-6i+5j)
=(-7*(-6))i+(4*5)j
=-42i+20j

Hence the answer is:
v*w=(-42i+20j)

8 0

2 years ago

Read 2 more answers

The average number of students per class at a middle school

Tasya [4]

Answer:

s = 22t or $\frac{t}{s} = \frac{1}{22}$ , when s is students and t is teachers.

Step-by-step explanation:

I. Given t = teacher, s = student

When 1 teacher per 22 students so...

s = 22t

If there're 10 teachers

s = 22(10)

= 220 or $\frac{t}{s} = \frac{1}{22}$

Hope that help :)

8 0

2 years ago

Solve for n.<br> Q=5n+5z

kirill115 [55]

$q=5n+5z\ \ \ \ \ \ \ |subract\ 5z\\\\q-5z=5n\ \ \ \ \ \ \ |divide\ by\ 5\\\\n=\frac{q-5z}{5}\\\\Answer\ is\ n=\frac{q-5z}{5}$

5 0

3 years ago

Read 2 more answers