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Mice21 [21]
2 years ago
7

Find the value of:3x^2+2x-4When x=4​

Mathematics
2 answers:
Marina CMI [18]2 years ago
6 0

3x² + 2x - 4

=》x = 4

Substitute the value of 'x' in the expression.

3x² + 2x - 4

= 3(4)² + 2(4) - 4

= 3(16) + 8 - 4

= 48 + 8 - 4

= 56 - 4

= 52

_______

Hope it helps ⚜

a_sh-v [17]2 years ago
3 0

Refer to the attachment!

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SOMEONE HELP ASAPPPPPPP!!! PLEASE
Rom4ik [11]
(1) See below for a diagram. Basically, the distance on the ground from the person to the building (34 ft) is adjacent to the angle of elevation (74 degrees) and the height of the building (labeled h in the diagram) is the side opposite the angle. Since we are dealing with opposite and adjacent we use the tangent of the angle and tan = opp/adj

Specifically, tan74= \frac{h}{34}
h=(34)(tan74)<span class="_wysihtml5-temp-placeholder"></span>
h=118.6 feet.

Please be sure your calculator is set to degrees (not radians) when you do this problem.

(2) Here since P & Q are complimentary it means that their sum is 90 degrees. Since this is a right triangle that means that the remaining angle (R) must be the right angle. See below for a diagram.

sin = opp/hyp. As the sin Q =  9/41 this means that 9 is the length of the side opposite Q (the side PR) and 41 is the length of the hypotenuse. This makes the remaining side (QR) 40 in length.

cos = adj/hyp. If we focus on angle P the side adjacent (next to) is 9 and the hypotenuse is 41. Thus the cos of P = 9/41.

You could have also realized that if P & Q are complimentary the sin P = cos Q and the cos P = sin Q. We were not asked about tangent but it is also the case that tan P = cot Q and cot P = tan Q.

4 0
3 years ago
Find the square root of 13²​
nadezda [96]
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The volume of a room that is 23 feet in W , 10 feet in D, and 8 feet in H is?​
Solnce55 [7]

The volume of the room is: 1840 ft^3

Step-by-step explanation:

The volume is the capacity of a given figure.

Given

Width = w = 23 feet

Depth = d = 10 feet

Height = h = 8 feet

The formula for volume is:

V = W*D*H\\= 23*10*8\\=1840\ ft^3

The volume of the room is: 1840 ft^3

Keywords: Volume, Box

Learn more about volume at:

  • brainly.com/question/2115122
  • brainly.com/question/2116906

#LearnwithBrainly

6 0
3 years ago
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