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3 years ago

Help pls 6th grade math i will give brainliest

Mathematics

1 answer:

Olenka [21]3 years ago

8 0

Answer:

It is A, you are right.

Step-by-step explanation:

This is the distributive property of multiplication.

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For f (x)= -x + 8, what is the value of x for which f(x) = 9?

Elina [12.6K]

Answer:

x=-1

Step-by-step explanation:

f (x)= -x + 8

Let f(x) = 9

9 = -x+8

Subtract 8 from each side

9-8 = -x+8-8

1 = -x

Multiply each side by -1

-1 = x

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3 years ago

amanda has $40 to spend on flowers. she bought a vase for $18. at most how much can she spend on flowers

masha68 [24]

Answer:

at most she can spend $22 on flowers

Step-by-step explanation:

hope this helped :)

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4 years ago

a greenhouse grew tomato plants. it sold 276 tomatos and 307 roses. there are 187 tomato plants left. how many tomato plants did

ella [17]

Answer:

463 tomato plants

Step-by-step explanation:

Add 276 (amount sold) by 187 (amount left).

276+187=463

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3 years ago

Read 2 more answers

What is 56 divided by 19

tresset_1 [31]

2.947368421 when dividing you want to make sure te numbers are divisible <span />

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4 years ago

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If f(x) =4x2 - 8x - 20 and g(x) = 2x + a, find the value of a so that the y-intercept of the graph of the composite function (fo

amm1812

Answer:

The possible values are a = -2.5 or a = 4.5.

Step-by-step explanation:

Composite function:

The composite function of f(x) and g(x) is given by:

$(f \circ g)(x) = f(g(x))$

In this case:

$f(x) = 4x^2 - 8x - 20$

$g(x) = 2x + a$

$(f \circ g)(x) = f(g(x)) = f(2x + a) = 4(2x + a)^2 - 8(2x + a) - 20 = 4(4x^2 + 4ax + a^2) - 16x - 8a - 20 = 16x^2 + 16ax + 4a^2 - 16x - 8a - 20 = 16x^2 +(16a-16)x + 4a^2 - 8a - 20$

Value of a so that the y-intercept of the graph of the composite function (fog)(x) is (0, 25).

This means that when $x = 0, f(g(x)) = 25$ . So

$4a^2 - 8a - 20 = 25$

$4a^2 - 8a - 45 = 0$

Solving a quadratic equation, by Bhaskara:

$\Delta = (-8)^2 - 4(4)(-45) = 784$

$x_{1} = \frac{-(-8) + \sqrt{784}}{2*(4)} = \frac{36}{8} = 4.5$

$x_{2} = \frac{-(-8) - \sqrt{784}}{2*(4)} = -\frac{20}{8} = -2.5$

The possible values are a = -2.5 or a = 4.5.

5 0

3 years ago