English | Español

# Try our Free Online Math Solver! Online Math Solver

 Depdendent Variable

 Number of equations to solve: 23456789
 Equ. #1:
 Equ. #2:

 Equ. #3:

 Equ. #4:

 Equ. #5:

 Equ. #6:

 Equ. #7:

 Equ. #8:

 Equ. #9:

 Solve for:

 Dependent Variable

 Number of inequalities to solve: 23456789
 Ineq. #1:
 Ineq. #2:

 Ineq. #3:

 Ineq. #4:

 Ineq. #5:

 Ineq. #6:

 Ineq. #7:

 Ineq. #8:

 Ineq. #9:

 Solve for:

 Please use this form if you would like to have this math solver on your website, free of charge. Name: Email: Your Website: Msg:

# Math 70 Exam 2 Solutions

1. To find the temperature in degrees Fahrenheit, evaluate the formula with C = 30. Note: or you can simplify the numerator and denominators before
multiplying the fractions

So, the temperature is 86°Fahrenheit.

2. (a) Distribution with the inner set of parenthesis: You can distribute the 2y into the brackets or you can combine like terms inside the brackets.
I will be combining like terms first: So, 2y[3y + 2(y − 1)] simplifies to 10y^2 − 4y.

(b) Using the product rule for exponents :  3. (a) Simplifying the right-side of the equation: x + 3 = −4 -> x = −7 ( Subtracting 3 from both sides)

Solution : x = −7

Check:
Left-side of equation: −7 + 3 = −4
Right-side of equation: −12 + 8 = −4

(b) Dividing both sides by 5: Solution: y = 0.5

Check:

Left-side of equation: 5(0.5) = 1.5
Right-side of equation: 1.5

(c) Combining like terms on the left -side of the equation: (Dividing both sides by 4 and simplifying)

Solution: x =3/2

Check:
Left-side of equation: Right-side of equation: (d) Distributing the left-side of the equation:  (Subtracting 2x from each side.) ( Adding 8 to each side .) (Dividing both sides by 2.)

Solution: x = 5

Check:

Left-side of equation: 4(5 − 2) = 4(3) = 12
Right-side of equation: 2(5) + 2 = 10 + 2 = 12

(e) Here are a couple of ways to solve this : (Subtracting 3/2 from each side.) • Clearing the fractions:

The LCD of the denominators 6 and 2 is 6. Multiplying both sides by 6:  since x = −3 (Subtracting 9 from both sides.)

Solution: x = −3

Check:

Left-side of equation: Right-side of equation: 1

4. Unknowns :
Pounds of peanuts = x
Pounds of chocolate = 3x

Equation: Since we want a total of 20 pounds when we combing peanuts and chocolate, the
equation is x + 3x = 20.

Combining the like-terms on the left side:

 4x = 20 x = 5 (Dividing both sides by 4.)

-> You need 5 pounds of peanuts and 15 pounds of chocolate.

5. Using the equation Distance = Rate(Time), we have that

Distance = (1.4 ft/min)(20 min) = 28 feet.

So, Sam will travel 28 feet in 20 minutes.

Extra Credit:

No matter how you tip, you will have to pay the \$40 for the dinner and \$40(0.10) = \$4 for the tax,
which would give you a total of \$44 not including the tip.

If you apply the tip to just the bill without tax, then you are tipping on the amount of \$40. So, you
would give a tip of \$40(0.15) = \$6.

If you apply the tip to the bill including tax, then you are tipping on the amount of \$44. So, you would
give a tip of \$44(0.15) = \$6.60.

So, if you tip on the pre -tax amount, you leave a tip of \$6. If you tip on the post-tax amount, you leave
a tip of \$6.60.