if a=3, b=-1 and c=0 determine the value of
(a) abc (b) (a+b)x2 (c) ab over c

Question

if a=3, b=-1 and c=0 determine the value of 
(a) abc        (b) (a+b)x2      (c) ab over c

anonymous · Answer

abc=3(-1)(0)=0
2(a+b)=2(3-1)=2(2)=4
ab/c=-3/0 not defined

anonymous · Answer

in grade 8, need to know what the rules are behind that sum...confused.  test tomorrow :(

anonymous · Answer

never divide by 0,this is the rule for grade 8...
adding signed numbers shouldn't be a problem,multiplying them as well..

anonymous · Answer

please explain what you mean by a signed number?

anonymous · Answer

a number having a + or - before it

anonymous · Answer

$$\sqrt{64x ^{2}}y ^{4}$$  -please can you explain how to simplify this

anonymous · Answer

$$\sqrt[3]{27a ^{9}}y ^{3}   $$       please can you explain how to simply this

anonymous · Answer

$$\sqrt{64x ^{2}y ^{4}}=\sqrt{8^{2}x ^{2}(y ^{2})^{2}}=8xy ^{2}$$

anonymous · Answer

$$\sqrt[3]{27a ^{9}y ^{3}}=\sqrt[3]{3^{3}(a ^{3})^{3}y ^{3}}=3a ^{3}y$$

anonymous · Answer

subtract   $$2x ^{2}y ^{4}$$   from  $$3x ^{2}-7x+3$$

anonymous · Answer

never mind i got the answer

anonymous · Answer

simplify   $$-5x-9x$$

anonymous · Answer

you should try first...

anonymous · Answer

k but i realy suck at maths im failing it

anonymous · Answer

if im right it should be -14

anonymous · Answer

-14x

anonymous · Answer

oh i forgot the x

anonymous · Answer

im realy stuck with this one 
solve for x
$$-2x-1=-11$$
$$4x \over 5$$ =8

anonymous · Answer

-2x-1=-11    move -2x to the right handside it becomes 2x
-1=-11+2x    move -11 to the left handside it becomes 11
11-1=2x
10=2x    divide both sides by 2
5=x

anonymous · Answer

thank you so much hope to chat again

anonymous · Answer

nope