1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
goldenfox [79]
3 years ago
13

The following picture is a square pyramid where DE=8 cm and m∠ADE=60°.

Mathematics
1 answer:
mr_godi [17]3 years ago
5 0

Answer:

131 cm

Step-by-step explanation:

formula for surface area of pyramid is

S = (1/3)Bh

but the base ia a square, so B = x^{2}

S = (1/3)x^{2} h

the pic shows h = 8

but we don't know x

do SohCahToa

sin60 = x/8

x = 8sin60

x = 6.92820323 or 7

plug in numbers

S = (1/3)7^{2}8

S = 392/3

S = 130.6666667 or 131 cm

You might be interested in
[BRAINLIEST GIVEAWAY] To join answer this question
elena-s [515]
The brainliest answer you are looking for is 48cm2
8 0
3 years ago
How many hours he worked
Bogdan [553]
8.50x+100=308.25
subtract 100 from both sides
8.5x = 208.25
divide 8.5 from both sides
x= 24.5 hours worked
4 0
3 years ago
Find the equation of the line I in the following picture. The shapes under the lines are squares
julia-pushkina [17]
If you look carefully at the graph, you may see that the slope of the line is
          3-4           -1
---------------- = ------ = m
         7-4             3

thus, you have the slope of the line and two points on the line.  Suppose we
choose the point (4,4) and subst. the known slope and the coordinates of this point into the point-slope formula for the eqn of a str line:

y-y1 = m (x-x1)

y-4 = (-1/3)(x-4)

This is the desired equation.  You could, if you wished, change this into slope-intercept form.
5 0
3 years ago
Determine 3rd term in the geometric sequence whose first term is -8 and whose common ratio is 6
Brrunno [24]
-8, -48, -288
or
-8, -4/3, -2/9
3 0
3 years ago
Read 2 more answers
Write the equation of the line passing through the points (-1,2) and (3, 4)
Harlamova29_29 [7]

Answer:

y=2/4x+5/2

Step-by-step explanation:

y=mx+b

2-4/-1-3

-2/-4

Slope =2/4

y=2/4x+b

2=2/4(-1)+b

b=5/2

y=2/4x+5/2

3 0
3 years ago
Read 2 more answers
Other questions:
  • Describe a situation that can be modeled by the expression x-8
    12·1 answer
  • A group of first grade students were asked to name their favorite color. The responses are shown in the following frequency tabl
    6·1 answer
  • Alex had $250, and he decided to give 18% of that amount as a donation. How much money did he donate?
    8·2 answers
  • A scientist measured the water pressure at different depths. She made a table showing her findings. The x-values represent the d
    8·2 answers
  • Explain How you got that answer
    12·1 answer
  • The grocery store has bulk pecans on sale, which is great since you're planning on making 9 pecan pies for a wedding. How many p
    9·1 answer
  • A new drug is being proposed for the treatment of migraine headaches. Unfortunately, some users in early tests of the drug have
    6·1 answer
  • Graph the following equation <br><br> Please
    5·1 answer
  • Assuming a 2.5% discount will apply , what is the net price of an invoice for $1,275.55 ?a) $1,136.66 b) $1,243.66 c)$1,250.00 d
    15·2 answers
  • If 3/4 of a cup of yogurt is 80 calories, how many calories are in 1/4 of a cup?​
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!