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mina [271]
3 years ago
13

Evaluate the expression shown below and write your answer as a fraction in simplest form. 3 (-20 8 Answer: Submit Answer attempt

1 out of 2 O​

Mathematics
1 answer:
Nimfa-mama [501]3 years ago
8 0

Answer:

-\frac{1}{40}

Step-by-step explanation:

To evaluate -\frac{3}{8} - (-\frac{7}{20}), start by opening the bracket.

When opening the bracket, we would be multiplying negative sign by negative sign, which equal positive sign.

Thus,

-\frac{3}{8} + \frac{7}{20}

Solve further by performing addition operation to make both fractions one

The common denominator of 8 and 20 is 40,

\frac{5(-3) +2(7)}{40}

\frac{-15 + 14}{40}

\frac{-1}{40} = -\frac{1}{40}

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4. A sports car accelerates from rest to a final velocity of 64 m/s at a rate of 12.3
Ivanshal [37]

Answer:

t = 5.2\ s

Step-by-step explanation:

Given

a= 12.3m/s^2 --- acceleration

v = 64m/s --- final velocity

u =0m/s --- initial velocity (it is 0, because the car starts from rest)

Required

Determine the time taken

This will be solved using Newton's first equation of motion:

v = u + at

Substitute values for v, u and a

64 = 0 + 12.3*t

64 = 12.3t

12.3t = 64

Make t the subject

t = \frac{64}{12.3}

t = 5.2\ s

<em>Hence, the time taken is approximately 5.2 seconds</em>

6 0
3 years ago
How do you round up fractions?
qaws [65]

Answer:

If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up.  If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down.

hope it helps

7 0
3 years ago
I need to know the answer I got cancer and I fell tired and I need to do this and no one is helping me
Sergeeva-Olga [200]
AZ = 1.5 inches ( 1 and a half inches)
3 0
2 years ago
Pleaassseeeee helpppppp,,,,!!!!!!
Flura [38]
Surface Area (SA) of a Cylinder formula:
SA = 2*pi*r*h+2*pi*r^2
If you fill in the formula:
SA = 2*3.14*2*9+2*3.14*2^2
Simplify:
SA = 6.28*18+6.28*4
SA = 113.04 + 25.12
SA = 138.16 in
I hope I helped 
If its wrong I'm super duper extra sorry!
6 0
3 years ago
How can you create inequalities in one variable and use them to solve problems?
Scrat [10]
Usually, you create the inequality by casting the problem statement into mathematical terms. Then, solving the inequality can answer the question posed by the problem statement.

Example:
   I want to carpet my 1600 ft² house, but I can only afford to spend $3000. Tax and installation costs are expected to add 20% to the total cost of the carpet. What price range of carpet should I be looking at in term of dollars per square yard?

Solution:
  Let p represent the price per square yard of carpet. The problem statement tells me
   (1600 ft²)×((1 yd)/(3 ft))²×p×(1 + 0.20) ≤ $3000 . . . . . created inequality
   p×((1600×1.20)/9 yd²) ≤ $3000 . . . . . . . . . . . . . . . . . simplify left side
   p ≤ $14.06/yd²
I can afford carpet that costs less than $14.06 per square yard.
3 0
3 years ago
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