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scoray [572]
3 years ago
14

Helppppp pls and thankyouuu

Mathematics
1 answer:
Nataliya [291]3 years ago
3 0

Answer:

20 minutes on the stationary bike

10 minutes on the treadmill

Step-by-step explanation:

x = minutes on bike

y = minutes on treadmill

x + y = 30

12x + 15y = 390

x = 30-y

12(30-y) + 15y = 390

360 - 12y + 15y = 390

3y = 30

y = 10

x + 10 = 30

x = 20

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During a figure skating routine, Jackie and Peter skate apart with and angle of 15 degrees between them. Jackie skates for 5 met
Xelga [282]

Answer:

The skaters are 2.5 feet apart

Step-by-step explanation:

Firstly, please check attachment for diagrammatic representation.

To calculate the distance apart, this is same as the length PJ

To calculate this length, we can use the cosine rule as follows;

O^2 = P^2 + J^2 -2(P)(J)Cos 15

O^2 = 7^2 + 5^2 -2(7)(5)Cos 15

O^2 = 49 + 25 - 70Cos15

O^2 = 74 - 67.61

O^2 = 6.39

O = √6.39

O = 2.53

O = 2.5 feet to the nearest tenth of a foot

3 0
3 years ago
Consider these numbers, ordered from least to greatest. Negative 1.8, negative 1 and one-fourth, negative 0.2, blank, one-half,
Norma-Jean [14]

Answer:

10%

-0.1

1/4

Step-by-step explanation:

Complete question

Consider these numbers, ordered from least to greatest. Negative 1.8, negative 1 and one-fourth, negative 0.2, blank, one-half, 90 percent A number line going from negative 2 to positive 1. Which values could correctly fill in the blank? Select all that apply. 10% 1 -0.1 -1 One-fourth

step-by-step explanation

On the number line, numbers increase from left to right.

The blank is between -0.2 and 1/2.

Only numbers greater than -0.2 and less than 1/2 can fill the blank.

Range = -0.2<x<1/2

From the values given,

1) 10% = 10/100 = 1/10 = 0.1

-0.2<0.1<1/2

2) -0.2<1

But, 1>1/2

3) -0.2<-0.1<1/2

4) -0.2>-1

5) -0.2<1/4<1/2

Therefore, only 10%, -0.1, and 1/4 can fill in the blank correctly because they satisfy the range -0.2<x<1/2

5 0
3 years ago
Read 2 more answers
In 2016 there were about 64,500 cinema screens in a country. If about 29.9% of screens in the country were digital 3-D screens,
zhenek [66]

Answer:

Step-by-step explanation:

In 2016 there were about 64,500 cinema screens in a country.

If about 29.9% of screens in the country were digital 3-D screens, we would determine the approximate number of 3D screens by dividing the Percentage of 3D screens by the total percentage of 100 and multiplying by the total number of cinema screens. It becomes

29.9/ 100 × 64500 = 0.299 × 64500

= 19285.5

The number of 3D screens is approximately 19286

6 0
4 years ago
Simplify 15-7 2 using order of operations
Butoxors [25]
16 is the solution to this if you're multiplying the 2
5 0
3 years ago
Help me please please please
Westkost [7]

Answer:

600cm2

Step-by-step explanation:

x3

6 0
3 years ago
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