2a - 10 = 5(4+.2a)

Linear equations

Step-by-step explanation:

2a-10=5(4+.2a)

Use the distributive property to multiply 5 by 4+0.2a..

2a-10=20+a

Subtract a from both sides.

2a-10-a=20

Combine 2a and -a to get a.

a-10=20

Add 10 to both sides.

a=20+10

Add 20 and 10 to get 30.

a=30

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

soo this can be solve by using the formula:

f = p( 1 + i)^ n

where f is the future profit

p is the initial profit

i is the percent increase

n is the number of years

a . f = 30000 ( 1.05)^n

b. f = 30000 ( 1.05)^15

f = $62,368