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4 years ago

UGHH I always get stuck on solving these system of equations, help me?!

Mathematics

1 answer:

ASHA 777 [7]4 years ago

7 0

First one:
2x + y = -7-1
2x + x + 10 = -8
3x + 10 = -8
3x = -18
x= -6

Idk the second one. SOOORRRYYY!

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A clay model of a new car is 7 in. long if the car is 21 ft long how could you find the scale used to make the model

Marysya12 [62]

Answer:

The scale model = 1 :36 or 1 to 26

Step-by-step explanation:

A clay model of a new car is 7 in. long if the car is 21 ft long

Note that:

1 foot = 12 inches

21 foot =

Cross Multiply

21 foot × 12 inches

= 252 inches

Therefore, the scale =

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3 years ago

An exponential function has a starting value of 13 and a growth rate of 0.78%. Write an equation to model the situation.

Elina [12.6K]

Answer:

The equation that models the situation is $A(t) = 13(1.0078)^t$

Step-by-step explanation:

Exponential equation:

An exponential equation has the following format:

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Starting value of 13 and a growth rate of 0.78%.

This means that $A(0) = 13, r = 0.0078$

Write an equation to model the situation.

$A(t) = A(0)(1+r)^t$

$A(t) = 13(1+0.0078)^t$

$A(t) = 13(1.0078)^t$

The equation that models the situation is $A(t) = 13(1.0078)^t$

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3 years ago

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Aleksandr [31]

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Step-by-step explanation:

similar triangle so corresponding parts are similar

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3 years ago

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finlep [7]

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Answer:

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2 years ago