She had spent $78 on books but idk what to do with the book mark cuz it ask for the total # of books not book marks
Answer:
x = -2, y = -3
Step-by-step explanation:
Multiply eqn1 by the LCM of 1 and 6 i.e coefficients of x
We get:
<u> </u><u> </u> 6x - 54y = 150 (eqn1)
<u>6x - 5y = 3</u> (eqn2)
<u> - 49y = 147</u>
y = <u>147</u>
-49
y = -3
Substitute y in eqn2
6x - 5(-3) = 3
6x + 15 = 3
6x = -12
x = -2
Answer:
296.96 m
Step-by-step explanation:
Answer:
Step-by-step explanation:
we know that
The surface area of the regular pyramid is equal to the area of the triangular base plus the area of its three triangular lateral faces
step 1
Find the area of the triangular base
we know that
The triangular base is an equilateral triangle
so
The area applying the law of sines is equal to
step 2
Find the area of its three triangular lateral faces
we have
Find the height of triangles
Applying the Pythagorean Theorem
solve for h
substitute
step 3
Find the surface area
Adds the areas
Round to the nearest tenth
Answer:
You can't
Step-by-step explanation: