### Solution

a

$a−2t=-10$

SubEqn$LHS−a=RHS−a$

$-2t=-10−a$

DivEqn$LHS/(-2)=RHS/(-2)$

$t=-2-10−a $

FactorOutNegSignFactor out a minus sign

$t=-2-(10+a) $

DivNegNeg$-b-a =ba $

$t=210+a $

b

$S=C+rC$

FactorOutFactor out $C$

$S=C(1+r)$

DivEqn$LHS/C=RHS/C$

$CS =1+r$

SubEqn$LHS−1=RHS−1$

$CS −1=r$

RearrangeEqnRearrange equation

$r=CS −1$

c

$u=vw+z$

SubEqn$LHS−z=RHS−z$

$u−z=vw$

DivEqn$LHS/v=RHS/v$

$vu−z =w$

RearrangeEqnRearrange equation

$w=vu−z $

d

$A=Bxy+C$

SubEqn$LHS−C=RHS−C$

$A−C=Bxy$

DivEqn$LHS/Bx=RHS/Bx$

$BxA−C =y$

RearrangeEqnRearrange equation

$y=BxA−C $

### Hint

a

Isolate the variable using inverse operations.

b

Isolate the variable using inverse operations.

c

Isolate the variable using inverse operations.

d

Isolate the variable using inverse operations.

### Answer

a

b

c

d