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3 years ago

What strategy would be the best to solve this problem?

Mathematics

1 answer:

neonofarm [45]3 years ago

5 0

Answer:

32 years old

Step-by-step explanation:

Reverse what the teacher said. Half 120 to get 60. Subtract 28 from 60. The teacher is 32.

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7a + 8 = 20 solve for a

hram777 [196]

Answer:

a= $\frac{12}{7} or 1\frac{5}{7}$

Step-by-step explanation:

8 0

3 years ago

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Find the perimeter of the figure.

Snowcat [4.5K]

Answer:

40 cm

Step-by-step explanation:

15 + 5 + 3 + 9 + 3 + 5 = 40 cm

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2 years ago

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Solve the formula for the indicated variable.

kolbaska11 [484]

Answer: b = p - a -c

Step-by-step explanation:

p= a + b + c Solving for b means getting b on one side by itself.

p = a + b + c To solve for b first subtract a from both sides to get,

-b -b

p - a = b + c Now subtract c from both sides to get

-c -c

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3 years ago

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Use the Law of Cosines to find the values of x and y. (PLEASE HELPPP!!!!)

vredina [299]

Answer:

$x = 49.8^\circ\\y = 54.6^\circ$

Step-by-step explanation:

Kindly refer to the image attached in the answer region for labeling of triangle.

AB = 16

BC = 19

AC = 15

$\angle ABC = x^\circ\\\angle ACB = y^\circ$

We have to find the angles x and y i.e. $\angle B \text{ and }\angle C$ .

Formula for cosine rule:

$cos B = \dfrac{a^{2}+c^{2}-b^{2}}{2ac}$

Where

a is the side opposite to $\angle A$ ,

b is the side opposite to $\angle B$ and

c is the side opposite to $\angle C$ .

$\Rightarrow cos x = \dfrac{19^{2}+16^{2}-15^{2}}{2 \times 19 \times 16}\\\Rightarrow cos x = \dfrac{392}{608} \\\Rightarrow x = 49.8^\circ$

Similarly, for finding the value of y:

$cos C = \dfrac{a^{2}+b^{2}-c^{2}}{2ab}\\\Rightarrow cos y = \dfrac{19^{2}+15^{2}-16^{2}}{2 \times 19 \times 15}\\\Rightarrow cos y = \dfrac{330}{570}\\\Rightarrow y = 54.6^\circ$

Hence, the values are:

$x = 49.8^\circ\\y = 54.6^\circ$

7 0

3 years ago

The first 5 terms of a quadratic sequence are

Mashcka [7]

Step-by-step explanation:

an = 2n^2 - 3 · Anonymous. -1, 5, 15, 29, 47, ... an = 2 n^2 - 3.

8 0

2 years ago