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3 years ago

MARIA IS GOING FOR A RUN. AFTER 20 MINUTES, SHE HAS

Mathematics

1 answer:

Sunny_sXe [5.5K]3 years ago

4 0

Answer:

7.25 mph(miles per hour)

Step-by-step explanation:

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Find the sum.<br> 14 + 42 + 70 + ... + (28n − 14)

lions [1.4K]

Answer:

14n^2.

Step-by-step explanation:

This is Arithmetic with first term a = 14 and common difference d = 28.

Sum of n terms = n/2[2a + (n-1)d]

= n/2(28 +( n -1)28]

= n/2(28 + 28n - 28)

= 14n^2

5 0

2 years ago

Read 2 more answers

Is the product of 8 positive numbers<br> And 3 negative numbers positive or<br> Negative?

avanturin [10]

Answer:

Negative

Step-by-step explanation:

The 8 positive numbers give you a positive, and a positive times negative is negative, then negative times negative is positive, and positive times negative is negative. Your final number would be negative.

7 0

3 years ago

Determine whether the points lie on straight line.

wel

Answer:

A) Non-collinear- does not lies on straight line

B) Collinear- lie on straight line

Step-by-step explanation:

We have to check collinearity of three points.

The points $(x_1, y_1, z_1),(x_2, y_2, z_2),(x_3, y_3, z_3)$ are said to be collinear if,

$\left[\begin{array}{ccc}x_1&y_1&z_1\\x_2&y_2&z_2\\x_3&y_3&z_3\end{array}\right] = 0$

A) A(2, 5, 3), B(3, 7, 1), C(1, 4, 4)

$\left[\begin{array}{ccc}2&5&3\\3&7&1\\1&4&4\end{array}\right] \\\\=2(28-4)-5(12-1)+3(12-7)\\= 8 \neq 0$

Thus, the given points are not collinear.

B) D(0,-5,5), E(1,-2,4), F(3,4,2)

$\left[\begin{array}{ccc}0&-5&5\\1&-2&4\\3&4&2\end{array}\right] \\\\=0(-4-16)+5(2-12)+5(4+6)\\=0$

Thus, the given points are collinear.

6 0

3 years ago

Evaluate 5^2 + 10 ÷ 2.

Kaylis [27]

Answer:

Step-by-step explanation:

5^2 + 10 ÷ 2

25 + 10 ÷ 2

25 + 5

6 0

3 years ago

Read 2 more answers

What is the slope of the line that passes through the points (-10, 8) and

vlada-n [284]

Answer:

$slope=3$

Step-by-step explanation:

Use the following equation the find the slope:

$\frac{y_{2}-y_{1}}{x_{2}-x_{1}} =\frac{rise}{run}$

Rise over run is the change in the y-axis over the change in the x-axis from one point to the other. This is also known as the "slope". Insert the known values:

$(-10_{x1},8_{y1})\\\\(-15_{x2},-7_{y2})\\\\\\\frac{-7-8}{-15-(-10)}\\\\\frac{-7-8}{-15+10}$