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weeeeeb [17]
2 years ago
8

Find the percent decrease. Round to the nearest percent. From 86°F to 68°F

Mathematics
2 answers:
Mama L [17]2 years ago
8 0

Answer:

21%

Step-by-step explanation:

To find the decrease subtract 68 from 86

86 - 68 = 18

Divide 18 by the original temperature -

18/86 = 0.209

Multiply 0.209 by 100 to find the percent -

20.9%

Round to the nearest percent -

21%

kow [346]2 years ago
6 0
It’s 27 but it you want it rounded then I think it’s 30
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Please help! i'm confused!<br> Find the area of a kites with diagonals 9in and 12in.
kolbaska11 [484]
Notice the picture
the rhombus, or kite, is really just 4 triangles
all sides are the same lenght in a rhombus,

thus, find the area of all of the triangles,
and you already have two sides given,
and then, add them up

or just find the length of one, and multiply times 4 :)

recall, area of a triangle = 1/2 bh

8 0
2 years ago
The hourly wage is $7.50. John worked 7 hour. How much did he<br> earn?
serg [7]

Answer:

52.5

Step-by-step explanation:

7.50 x 7

8 0
3 years ago
The quotient of a number x and 7 is greater than 5<br> write as an inequality
mariarad [96]

Answer:

x+7>5 there it is pay more attention in class cause that's cake

6 0
2 years ago
What is the domain and range of the function y = 2x2 - 4x - 10?
11111nata11111 [884]

Answer:

Step-by-step explanation:

The domain of all polynomials is all real numbers.  To find the range, let's solve that quadratic for its vertex.  We will do this by completing the square.  To begin, set the quadratic equal to 0 and then move the -10 over by addition. The first rule is that the leading coefficient has to be a 1; ours is a 2 so we factor it out.  That gives us:

2(x^2-2x)=10

The second rule is to take half the linear term, square it, and add it to both sides.  Our linear term is 2 (from the -2x).  Half of 2 is 1, and 1 squared is 1.  So we add 1 into the parenthesis on the left.  BUT we cannot ignore the 2 sitting out front of the parenthesis.  It is a multiplier.  That means that we didn't just add in a 1, we added in a 2 * 1 = 2.  So we add 2 to the right as well, giving us now:

2(x^2-2x+1)=10+2

The reason we complete the square (other than as a means of factoring) is to get a quadratic into vertex form.  Completing the square gives us a perfect square binomial on the left.

x^2-2x+1=(x-1)^2 and on the right we will just add 10 and 2:

2(x-1)^2=12

Now we move the 12 back over by subtracting and set the quadratic back to equal y:

2(x-1)^2-12=y

From this vertex form we can see that the vertex of the parabola sits at (1,-12).  This tells us that the absolute lowest point of the parabola (since it is positive it opens upwards) is -12.  Therefore, the range is R={y|y ≥ -12}

4 0
3 years ago
Surface area of this prism ?
beks73 [17]

Answer:The surface area of this prism is the squares

Step-by-step explanation:the reason being is that the square on top is the surface of the prism

7 0
3 years ago
Read 2 more answers
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