$3a+2b=10 \\\\ a+b=10 \\\\ \boxed{a=10-b} \\\\ 3(10-b)+2b=10 \\\\ 30-3b+b=10 \\\\ -b=10-30 \\\\ -b=-20 \\\\ \boxed{b=20} \\\\ a=10-20 \\\\ \boxed{a=-10}$

5 0

3 years ago

Please explain your answer

Ymorist [56]

Answer:

Step-by-step explanation:

11+(-7)^2-9 - original

11+49-9 - square the -7, since its in brackets the negative applies too and a negative x a negative = positive, so it ends up as 7x7+49

60-9 - add both positives 11+49=60

51 - subtract 9 from 60, 60-9=51

7 0

2 years ago

The formula for the volume of a right circular cone, V, is given below, where r represents the radius of the base of the cone an

Mrrafil [7]

Answer:

$r=\sqrt{\frac{3V}{(\pi h)}}$

Step-by-step explanation:

we know that

The volume of a right circular cone is equal to

$V=\frac{1}{3}\pi r^{2}h$

where

r is the radius of the base of the cone

h is the height

Solve for r-----> That means, isolate the variable r

step 1

Multiply by 3 both sides

$3V=\pi r^{2}h$

step 2

Divide by $(\pi h)$ both sides

$\frac{3V}{(\pi h)}=r^{2}$

step 3

take square root boot sides

$r=\sqrt{\frac{3V}{(\pi h)}}$

7 0

2 years ago

Read 2 more answers

Rico and Josh took off on skateboards going in the same direction. After 20min, Rico had traveled 5.98 kilometers and Josh had g

Alisiya [41]

Answer:

2.22 km

Step-by-step explanation:

Assuming initially both were at the same point ...

Distance from Rico = 5.98 km.

Distance from Josh = 8.2 km in the same direction.

If they were going in the same direction, then the final distance between the two can be written as follows:

d = 8.2 - 5.98 = 2.22 km

After 20 minutes, Rico and Josh were 2.22 km away. of distance between them.

7 0

3 years ago