Elton opened a compound interest savings account with $5500 in principal and an interest rate of 2.8%. If interest is compounded
1 answer:
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Answer:
Step-by-step explanation:
For the surface area we need to add up all the areas in the pyramid:
- area of the base
- area of the triangle sides (there are 4 triangles)
Area of the base:
the base is a square, and the area of a square is given by:
where is the length of the side:
, thus:
Area of the triangles:
one triangle has the area given by the formula:
where is the base of the triangle:
and is the height of the triangle:
, thus we have the following:
the expression that represents the surface area of the pyramid is:
substituting our values:
which is option B
Answer:
7 students are needed
Step-by-step explanation:
Consider the complete question is,
"Students deliver catalogues and leaflets to houses.One day, they have to deliver 480 C and 1520 L.Each student can deliver either 15 C or 80 L in 1 hour.Each student's can only work for 8 hours. Work out the minimum number of students needed."
Since, number of catalogues have to deliver = 480,
Number of leaflets have to deliver = 1520,
∵ Each student can deliver 15 catalogues or 80 leaflets in one hour.
Number of hours for working = 8,
So, the catalogues delivered by each student in a day = 15 × 8 = 120,
Similarly, the leaflets delivered by each student in a day = 80 × 8 = 640
Thus, the number of students required to deliver 480 catalogues
Again, the number of students required to deliver 1520 leaflets
≈ 3 students ( we would approximate above )
Hence, the minimum students required = 4 + 3 = 7