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garri49 [273]
2 years ago
11

Jack is 4 times as old as lacey. 7 years ago the sum of their age was 61. how old are they now?

Mathematics
1 answer:
BaLLatris [955]2 years ago
7 0
I am guessing Jack is 51 and Lacey is 17.

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Mohamed decided to track the number of leaves on the tree in his backyard each year. the first year, there were 500500500 leaves
VARVARA [1.3K]

Mohamed decided to track the number of leaves on the tree in his backyard each year. the first year, there were 500 leaves. each year thereafter, the number of leaves was 40% more than the year before. let f(n) be the number of leaves on the tree in Mohamed's backyard in the n^th year since he started tracking it. f is a sequence. what kind of sequence is it?

Number of leaves on the tree in first year = 500

The number of leaves was 40% more than the year before.

So rate of increase is 40/100 = 0.4

We use exponential growth formula,

f(n) = a(1+r)^n

Where a is the initial number, r is the rate of growth, n is the number of years

We know a= 500, r= 0.4

f(n) = 500(1+0.4)^n

f(n) = 500(1.4)^n

Plug in n=1,2,3...

f(1) = 500

f(2) = 500 * 1.4^1

f(3) = 500 * 1.4^2 and so on

From this we can see that the common ratio is 1.4

Hence it is a Geometric sequence.

8 0
3 years ago
Read 2 more answers
Use the area of the rectangle to find the area of the triangle.
tatyana61 [14]

Answer:

Answer is A

Step-by-step explanation:

Area of triangle = \frac{bxh}{2}

                          =\frac{10x5}{2}

                         =25

Area of rectangle = bxh

                             =10x5

                             = 50

6 0
2 years ago
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trey went to the batting cages to practice hitting. he rented a helmet for $4 and paid $0.75 for each group of 20 pitches. if he
Digiron [165]
First subtract 4 from 7 since they are just asking for the amount he paid for pitches. Then, take the difference (3) and divide it by .75 to get your answer (4 groups).
5 0
3 years ago
Five friends equally shared half of one large pizza and 1/4 of another large pizza. what fraction of each pizza did each friend
attashe74 [19]
1/2 divide by 5= 1/10
1/4 divide by 5=  1/20                              so    1/10 is also 2/20+1/20=3/20

so the answer is 3/20 of a pizza
 hope this helped and plz leave a thank you

3 0
3 years ago
A length of rope is stretch between the top edge of the building at stake in the ground the head of the state is at ground level
amid [387]

Because the tree is the halfway point, the building would be twice as tall:

The building is 38 x 2 = 76 feet tall.

3 0
3 years ago
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