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3 years ago

What is 4 hours and 39 mins before 7:53 p.m

Mathematics

2 answers:

Julli [10]3 years ago

5 0

4 hours and 39 minutes before 7:53 p.m. Is 3:14 p.m.

Alona [7]3 years ago

3 0

Its 3:14 p.m what you do is simply subtract 7:53 pm from 4:39 pm or you get a clock and count backwards

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What is -2x - 10=4 A 3 B -5 C -7 D 9

Fantom [35]

Answer: C -7

Step-by-step explanation:

-2 x -7 = 14

14 - 10 = 4

hope this helps

7 0

4 years ago

Circular tracts of land with diameters 900 meters, 700 meters and 600 meters are tangent to each other externally. There are hou

Rudik [331]

Answer:

$\alpha=69.28^o$

$\beta=61.26^o$

$\gamma=49.46^o$

$A=227980.26\ m^2$

Step-by-step explanation:

Triangle Solving

If we had a triangle will its three sides of known length, we can solve for the rest of the parameters of the triangle, i.e. the area, perimeter and internal angles.

The three circles have diameters 900 m, 700 m and 600 m and are tangent to each other externally. The distances from their centers (where houses are located) are the sum of each pair of the radius of the circles. Thus, the sides of the triangle are

$x=450+350=800$

$y=450+300=750$

$z=350+300=650$

The internal angles can be computed by using the cosine's law

$x^2=y^2+z^2-2yzcos\alpha$

$y^2=x^2+z^2-2xzcos\beta$

$z^2=x^2+y^2-2xycos\gamma$

Where \alpha, \beta and \gamma are the opposite angles to x, y and z respectively. Solving for each one of them:

$\displaystyle cos\alpha=\frac{y^2+z^2-x^2}{2yz}$

$\displaystyle cos\alpha=\frac{750^2+650^2-800^2}{2\cdot 750\cdot 650}$

$cos\alpha=0.3538$

$\alpha=69.28^o$

Similarly

$\displaystyle cos\beta=\frac{x^2+z^2-y^2}{2xz}$

$\displaystyle cos\beta=\frac{800^2+650^2-750^2}{2\cdot 800\cdot 650}$

$cos\beta=0.4808$

$\beta=61.26^o$

The other angle is computed now

$\displaystyle cos\gamma=\frac{x^2+y^2-z^2}{2xy}$

$\displaystyle cos\gamma=\frac{800^2+750^2-650^2}{2\cdot 800\cdot 750}$

$cos\gamma=0.65$

$\gamma=49.46^o$

The area can be found by

$\displaystyle A=\frac{1}{2}x.y.sin\gamma$

$\displaystyle A=\frac{1}{2}\cdot 800\cdot 750\cdot sin49.46^o$

$A=227980.26\ m^2$

8 0

3 years ago

A collection of nickels and dimes is worth $6.10. There are 67 coins in all. How many nickels are there?

Vesnalui [34]

22 nickels and 50 dimes

3 0

4 years ago

Simplify using law of exponents

8090 [49]

$625 {g}^{32} {k}^{48}$

3 0

4 years ago

Is the amount of rain in city upper b during april a discrete random variable, a continuous random variable, or not a random

larisa [96]

Answer: It is a continuous random variable.

The amount of rain is a continuous random variable because it can take on all of the numbers on a number line.

For example, the actual amount of rain in April could be 1 inch. Or 1.4 inches. Or 1.45 inches. Or 1.452020980234 inches. There are an infinite possibilities for the amount of rainfall.

6 0

3 years ago