MATHEMATICS
HIGH SCHOOL

Answer: 3t - 7 = 5t

Subtract 3t from each side: - 7 = 2t

Divide each side by 2 : - 3.5 = t

Subtract 3t from each side: - 7 = 2t

Divide each side by 2 : - 3.5 = t

Answer:

The answer is: t = -7/2 or t = -3.5.

The answer is: t = -7/2 or t = -3.5.

MIDDLE SCHOOL

Sheila has x 20 dollar bills, and Tamsin has y 10 dollar bills. Sheila has a total of $50 more than Tamsin, but Tamsin has 1 more bill than Sheila. How many bills does Sheila have?

Answer:

Sheila have 6 bills

Step-by-step explanation:

Suppose Sheila has x '20' dollar bills, so the total cost of her bill = $20x

Suppose Tamsin has y '10' dollar bills, so the total cost of her bill = $10y

Equation 1Sheila has a total of $50 more than Tamsin

10y + 50 = 20x

Equation 2Tamsin has 1 more bill than Sheila.

y = x + 1

Now solve them by putting value of x in equation

10( x + 1 ) + 50 = 20x

10x + 10 + 50 = 20x

60 = 20x - 10x

10x = 60

x = 60/10

x = 6

and

y = 7

MIDDLE SCHOOL

If a rectangle has a width of 5 and a perimeter of 26 what is the length of the rectangle

MIDDLE SCHOOL

Complete the square to slove 3x^2+12x=9

Answer:

Exact form :

x = ± √ 7 − 2

Decimal form :

x = 0.6457 , -4.6457

Step-by-step explanation:

3x^2+12x=9

We will use formula " (b/2)^2 to create new term,

We will solve for x to complete the square

Exact form :

x = ± √ 7 − 2

Decimal form :

x = 0.6457 , -4.6457

MIDDLE SCHOOL

a calculator can perform a single calculation in about 0.0000034sec.how much time will it take to calculate 4000 such calculations?express your answer in scientific notation

Answer:

0.0136 or 4000×34^-6

Explanation:

You would have to multiply and/or add the 0's