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gogolik [260]
3 years ago
8

Yesterday, there were 80 problems assigned for homework. Harry did 20% of them correctly. How many problems did Harry get right?

Mathematics
2 answers:
konstantin123 [22]3 years ago
4 0

Answer:

16 i think

Step-by-step explanation:

Len [333]3 years ago
3 0
Answer:16

...........................
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If 2^5 x 5^2 = 2^n x 10^2, what is the value of n?
Marat540 [252]

Answer: x = 0

Step-by-step explanation:

Move all terms to the left side and set equal to zero. Then set each factor equal to zero.

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Find an equation of the tangent to the curve at the point corresponding to the given value of the parameter. x=tcost, y=tsint, t
Umnica [9.8K]

Step-by-step explanation:

the answer is in the image above

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3 years ago
If you run for 0.4 hours at 7 mph, how fast should you walk during the next 0.8 hours to have the average speed of 5 mph?
Fantom [35]

Answer:

4 mph

Step-by-step explanation:

The average speed of an object is given by the total distance covered by the time taken:

v=\frac{d}{t}

where

d is the total distance covered

t is the time taken

in the first part, the person runs for 0.4 hours at a speed of 7 mph, so the distance covered in the 1st part is

d_1 = v_1 t_1 = (7)(0.4)=2.8 mi

Then the distance covered in the second part is d_2, so the total distance is

d=2.8+d_2 (1)

The total time elapsed is 0.4 hours (first part) + 0.8 hours (second part), so

t=0.4+0.8=1.2 h

So we can write the average speed as

v=\frac{2.8+d_2}{1.2} (1)

We want the average speed to be 5 mph,

v = 5 mph

Therefore we can rearrange eq.(1) to find d2:

d_2 = 1.2v-2.8 = (1.2)(5)-2.8=3.2 mi

And therefore, the speed in the second part must be

v_2=\frac{d_2}{t_2}=\frac{3.2}{0.8}=4 mph

4 0
2 years ago
Y + 0.5xy = x + 2; x = 1<br> How do you solve for y
vfiekz [6]

Step-by-step explanation:

replace the value of x with 1

y + 0.5 × 1 × y = 1 + 2

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y + 0.5y = 3

here the value of y is equal to 1. same goes for x, if we have no given value for them.

1.5y = 3

y = 3/1.5

y = 2

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3 years ago
Determine whether the relation is a function.
Alexxx [7]

Answer:

function

Step-by-step explanation:

every x value has only 1 y value

5 0
3 years ago
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