can you help with a few algebra questions?

Hi,

1) explain why the statements are incorrect and write correct answers..

a. 40mn/ 5m X 2n = 16 <==ANSWER

b. 8z + 18^z2 X 6/ 3z = 8z + 36z = 44z <==ANSWER

2) write algebraic equations for each of the following, using grouping symbols if necessary:

e. the product of a and b+ c subtracted from 5x 5x - a(b + c) <==ANSWER

f. the product of p^2 and the square p + 1 p²(p + 1)² <==ANSWER

4)

b. How long will it take a person to travel x km at y km/hr x/y hours <==ANSWER

c. write an equation for: 8 less than 6 times a number (x) is the same as 7 more than that number.

6x - 8 = 7 + x <==ANSWER

e. two angles of a triangle are x^o and y^o. Find the size of the third angle of the triangle.

180 - (x° + y°) <==ANSWER

I hope that helps!! :-)

PS My friend is originally from Queensland.

1) explain why the statements are incorrect and write correct answers..

a. 40mn/ 5m X 2n = 4

8n*2n=16n^2 is not 4

correct answer is 16n^2

b. 8z + 18^z2 X 6/ 3z = 9z

8z+(18z^2(6)/3z)=8z+36z=45z, not 9z

2) write algebraic equations for each of the following, using grouping symbols if necessary:

e. the product of a and b+ c subtracted from 5x

5x-[a(b+c)]

f. the product of p^2 and the square p + 1

(p^2)((p+1)^2)

4)

b. How long will it take a person to travel x km at y km/hr

(x km)/(y km/hr)=(x km)(1/y hr/km)=x/y hr/km

c. write an equation for: 8 less than 6 times a number (x) is the same as 7 more than that number.

6x-8=x+7

5x=15

x=3

e. two angles of a triangle are x^o and y^o. Find the size of the third angle of the triangle.

x+y+z=180

z=180-x-y

Can't tell if you mean (40mn/(5n)×2n or 40mn/(5n×2n)