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3 years ago

An orchard has 30 rows of apple trees. There are 3 trees in each row. How many apple trees are in the orchard?

Mathematics

2 answers:

inn [45]3 years ago

3 0

30 rows times 3 trees per row is 90 trees.

ivanzaharov [21]3 years ago

3 0

90, there would be 90 apple trees. You just have to multiply 30x3.

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Jacob can create an app in 24 hours, but if he works together with a friend they can create an app in 16 hours. How long would i

iogann1982 [59]

Answer:

Time taken by his friend to create the app alone = 48 hours.

Step-by-step explanation:

Hours needed by Jacob to create an app = 24 hours

$\text{One hour work of Jacob = }\frac{1}{24}$

Let hours needed by his friend in creating the app alone = x hours

$\text{So, one hour work of his friend = }\frac{1}{x}$

The both can create the app in 16 hours.

$\implies \frac{1}{24}+\frac{1}{x}=\frac{1}{16}\\\\\implies\frac{1}{x}=\frac{1}{16}-\frac{1}{24}\\\\\implies\frac{1}{x}=\frac{24-16}{24\times 16}\\\\\implies \frac{1}{x}=\frac{1}{48}\\\\\bf\implies x = 48$

Hence, Time taken by his friend to create the app alone = 48 hours.

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3 years ago

Kathy owns a farm house which contains 'birds and cows. There are 25 animals

Anastasy [175]

Answer:

Step-by-step explanation:

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3 years ago

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what is the formula for slope? ALL i need is the formula and if u cant give it to me than dont answer it.

babunello [35]

Slope= y2-y1 / x2-x1

6 0

3 years ago

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Find an equation of the circle that satisfies the given conditions. Endpoints of a diameter are P(−2, 1) and Q(8, 9)

IrinaK [193]

Answer:

Equation of the circle (x-3)²+(y-5)²=(6.4)²

x² -6x +9 +y² -10y +25 = 40.96

Step-by-step explanation:

Step(i):-

Given endpoints of diameter P(−2, 1) and Q(8, 9)

Centre of circle = midpoint of diameter

Centre = $(\frac{-2+8}{2} ,\frac{1+9}{2} )$

Centre (h, k) = (3 , 5)

Step(ii):-

The distance of two end points

PQ = $\sqrt{(x_{2}-x_{1} )^{2} +(y_{2} -y_{1} )^{2} }$

$PQ= \sqrt{(8+2 )^{2} +(8 )^{2} }$

PQ = √164 = 12.8

Diameter d = 2r

radius r = d/2

Radius r = 6.4

Final answer:-

Equation of the circle

(x-h)²+(y-k)² = r²

(x-3)²+(y-5)²=(6.4)²

x² -6x +9 +y² -10y +25 = 40.96

x² -6x +y² -10y = 40.96-34

x² -6x +y² -10y -7= 0

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3 years ago

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vlabodo [156]

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